Item Type: Pulley wheel Material: Nylon, Steel Weight: Approx. 1334g / 47.06oz Color: Black Diameter: Approx. 89mm / 3.5in Hole Inner Diameter: Approx. 1cm / 0.39in Package List 10 x Pulley Wheel 1. Please allow 1 to 3mm inaccuracy in the manual measurement, thank you 2. Due to differences between different monitors, the picture may not reflect the actual color of the item. 1[PREMIUM QUALITY MATERIAL] This bearing pulley wheel adopts quality nylon and iron core, made of nylon and quality bearing which is super wear resisting, strong and durable. 2[STEEL BEARINGS] Quality metal 6203RS bearing, preserves grease and prevents impurities from entering. No noise and smooth use with sturdy nylon sheaves bearings. 3[LIGHT WEIGHT AND SAFE] This universal pulley wheel is made of nylon which is light weight and still wearable, not easy to break. 4[10 PCS PACK] This product comes with 10 nylon pulley wheel. You can use it for a long time. Perfectly meets your various needs of different equipments. 5[MULTI APPLICATION] This universal pulley wheel is suitable for most scenes and equipment, and can be used for home fitness and garage door pulley systems, DIY home projects, fitness equipment, clotheslines, hoists, lifting blocks, ladder lifts, store lifts, etc.