![[QTY 1] (18x30x7 mm) 18307-2RS HYBRID CERAMIC Si3N4 Ball Bearing (Black) 18307RS](https://images-na.ssl-images-amazon.com/images/I/51FdntDp0kL._AC_SL3840_.jpg)

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1. Measurement: 18x30x7mm (0.7087" x 1.1811" x 0.2756") 2. Qty: 1 Pcs 3. Material: Chrome Steel 4. Closures: 2 Rubber Sealed 5. Cage: Nylon high speed ball retainer 6. Bearing Ball: Si3N4 (silicon nitride) 7. Usable With: Bike / Cycling / Bicycle 8. Please double check your instruction manual to confirm the size of the bearing.
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