ITEM NAME:10Pcs Nylon Plastic Carbon Steel Bearing Pulley Wheel Embedded Groove 5x23x7.3mm.10Pcs 5x23x7.3mm Nylon Plastic Carbon Steel Bearing Pulley Wheel Embedded Groove. Deep groove ball bearings, fashionable, slide flexible. 10 x Pulley Wheels. Bearing Material: High Carbon Steel. Quantity: 10 Pcs/1 Set.