2Pcs 18307 Hybrid Ceramic Bearing 18x30x7mm ABEC-7 Bicycle Bottom Brackets & Spares 18307RS Si3N4 Ball Bearings 18307-2RS

High-concerned chemical：None isCustomized：Yes Material：Bearing Steel Model Number：18307-2RS Brand Name：BNBG Origin：Mainland China Certification：None Bearing Material：Bearing steel Bearing type：Hybrid ceramic ball bearing Bearing Sizes：18x30x7 mm external diameter：30mm width：7 mm Bearing Characteristics：silent operation and high speed Application：Bicycle Bottom Brackets

High-concerned chemical: None isCustomized: Yes Material: Bearing Steel Model Number: 18307-2RS Brand Name: BNBG Origin: Mainland China Certification: None Bearing Material: Bearing steel Bearing type: Hybrid ceramic ball bearing Bearing Sizes: 18x30x7 mm external diameter: 30mm width: 7 mm Bearing Characteristics: silent operation and high speed Application: Bicycle Bottom Brackets