10 each ball bearings New old stock bearings Made by New Departure Double sheilded "armor gard" seals. ND 3203AC 17mm ID X 40 MM OD X 18.25 mm thick. 0.629" ID X 1.575" OD X 0.75" thick 2,900 lb dynamic load 11,000 rpm max. These bearings sell for $ 31.88 each from Mcmaster carr High-Capacity Steel Ball Bearings—ABEC-1 With two rows of ball bearings these bearings support higher radial loads than single-row bearings. The balls are held in place at 25° angles between the inner and outer sleeves. Shielded and sealed bearings come greased. Double-shielded bearings have steel shields that keep dirt out and lubricants in. Temperature range of -40° to +250° F. Hi Speed Hi Load 11,000 rpm 2,900 LBs small size