Pay in installments of $276.38 with
,
and
Shipping Estimate
USA
- USA
- CAN
- USA
- CAN
Ships within 48 hours · Estimated delivery Aug 2 - Aug 7
Promo Codes Available:
For Your Every Summer RSVP, with Code: SUMMER15
Description
Frontier Rotor R-S4x250/4MI and AdaptersFrontier rotors extend the functionality of Frontier centrifuges by increasing the number of tubes of varied types and sizes that can be used in conjunction with each of the centrifuge models. Easy to clean and operate, the rotors are durably constructed to withstand demanding centrifugation. R S4x250 4MI Rotor Maximum Speed 4,500 rpm Maximum Relative Centrifuge Force (x g) 3,780 g Maximum Capacity (Rotor) 4 x 250 ml Tube diameter without adapter N A
Frontier rotors extend the functionality of Frontier centrifuges by increasing the number of tubes of varied types and sizes that can be used in conjunction with each of the centrifuge models. Easy to clean and operate, the rotors are durably constructed to withstand demanding centrifugation.
R-S4x250/4MI Rotor
| Maximum Speed | 4,500 rpm |
| Maximum Relative Centrifuge Force (x g) | 3,780 g |
| Maximum Capacity (Rotor) | 4 x 250 ml |
| Tube diameter without adapter | N/A |
| Outer/Inner Radius | 167 mm |
| Rotor Style | Swing out |
| Aerosol tight | Not applicable |
| Acceleration Time (sec) | 34 / 309 |
| Angle | 0-90° |
| Compatible Models | FC5816; FC5816R |
| Deceleration Time (sec) | 34 / 458 |
| Dimensions (LxØ) | 13.31 in (338 mm) |
| Maximum loading weight | 2,144 g |
| Multiple Maximum Speeds | No |
| Net Weight | 8.96 lb (4.06 kg) |
| Working Environment | -4°F – 122°F, 95%RH, non-condensing (Temperature: -20ºC – 50ºC, Humidity: < 95%) |
Available Adapters:
- 5x4-10ml D16mm Sar 2/pk Rack
- 7x5-7ml D13mm Vac 2/pk Rack
- 7x5-7ml D13mm RB 2/pk Rack
- 9x4.5ml D12mm FB 2/pk Rack
- 10x1.5ml D11mm 2/pk Rack
- 9x5-7ml D13mm RB 2/pk Rack
- 7x15ml D17mm RB 2/pk Rack
- 1x15ml D17mm Rim 2/pk Rack
- 2x15ml D17mm FA 2/pk Rack
- 1x25ml D25mm RB 2/pk Rack
- 1x30ml D25mm Rim 2/pk Rack
- 1x50ml D29mm Rim 2/pk Rack
- 1x50ml D29mm FA 2/pk Rack
- 1x50ml D29mm RB 2/pk Rack
- 1x50ml D34mm RB 2/pk Rack
- 1x85ml D38mm RB 2/pk Rack
- 1x100ml D46mm RB 2/pk Rack
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.2 ★★★★★
Based on 18 reviews
Sort
Product Reviews
★★★★★ 5
Loooove these shoes!
Size: 7.5 Wide, Color: Chestnut Brown Faux Leather
I have these in several colors, and they’ve become a true staple in my wardrobe.
The Amazon Essentials Women's Belice Comfortable Slip-On Ballet Flats are exactly what I look for in an everyday shoe—simple, versatile, and comfortable right out of the box. The slip-on design makes them super convenient for busy days, and they pair effortlessly with everything from jeans to dresses to work outfits.
They’re lightweight but still feel supportive enough for all-day wear, and I appreciate that they don’t require a break-in period. The fit is generally true to size, and the variety of colors makes it easy to stock up and rotate depending on the outfit.
Overall, these are reliable, easy-to-wear flats that offer great value for the price. Not flashy, just consistently comfortable and practical—which is exactly why I keep coming back to them.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 5, 2026
★★★★★ 5
Has the look that they should cost more.
Size: 11.5 Wide, Color: Dark Turquoise
Comfortable and the fit is very comfortable. Looks great and extremely comfortable. Soft and light weight. Easy to put on. Sizing was perfect and the wide width is truly a wide. I’m coming back for more colors.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 1, 2026
★★★★★ 4
Good at price
Size: 9 Wide, Color: Sand
Fit a little small at my big toe but otherwise fit well. Heel rubbed slightly first 5 hour wear but no blister.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 9, 2026
★★★★★ 5
Lightweight comfortable at a good price!
Size: 10.5, Color: Navy
These shoes are perfect. The color matches my navy outfits as well as my denim. They are comfortable and they look great. They are easy to pack lightweight and a great value.
I am extremely satisfied and highly recommend!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 3, 2026
★★★★★ 3
REALLY CUTE SHOE BUT CUT WAY TOO SMALL!
Size: 8, Color: Black Patent
I received the black patent leather shoes today and they are so cute! Sadly I need to return them because they are cut way too small. I normally wear a 7.5 or 8 on dress shoes so I ordered the 8. They are so tight across the top that it's uncomfortable as soon as I put them on. They are smaller than a normal size 8 dress shoe. The big toe area is extremely uncomfortable because it doesn't allow any room for it at all, so my big toe just presses against the side and end of the shoe without even walking in them. I have very narrow feet and these still are too small for me. So I am returning them and I already ordered a 8.5 W and hope that will fit much better. The patent leather is very cute and adds just enough dressy that I can wear them with slacks or my Capri jeans. I like the slip on and the cushion foot bed because it feels soft.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 26, 2026
recommand products
Yamaha YZF-R6 Sport Bike Mirrors – ABS Carbon Look | Racing Motorcycle Rearview Set (Pair)
120.00
BMW S1000RR / M1000RR CNC Brake & Clutch Lever Protector Guard Blue (2019-Present)
107.00
Magnetic Suzuki Motorcycle Tank Bag with Straps – WEST BIKING Waterproof Waist & Leg Bag (Black)
79.00
BMW R1300GS Headlight Guard – Yellow Acrylic Headlight Protector Cover for BMW R1300GS 2024- (Easy Install, Durable Protection)
107.00
KTM 1290 Super Duke GT 19-24 Radiator Grill Guard Protector Orange
99.00