High Precision Ceramic Ball Ball Bearings 40BNC10HDU Ceramic Nachi Angular Ball Bearings Abec-7 40mm x 68mm x 15mm Made in Japan 40BNC10HDU Ceramic Nachi high precision Angular pair of Ball Bearings with 15 degrees contact angle and Polyamide resin cage, pair of ball bearings is 2 duplex bearings, bearings are ABEC-7 (P4) quality and made in Japan.