Features: 100% brand new and high quality. It is suitable for car, door, window, electric appliance, bearing, pump, carrier roller. Wear-resistant and corrosion resistant. No pollution, no radiation, no abnormal smell, environmental friendly. Material: rubber Total number: 225pcs Size:18 popular sizes(inner diameter*thickness) 20pcs: 3cm*1mm 20pcs: 4cm*1mm 20pcs: 4.5cm*2mm 20pcs: 5cm*2mm 20pcs: 6cm*2mm 20pcs: 6cm*2.5mm 5pcs: 13cm*3mm 5pcs: 14cm*1.5mm 5pcs: 17cm*2.5mm 5pcs: 18cm*4mm 5pcs: 20cm*2mm 5pcs: 22cm*2mm 20pcs: 6cm*3mm 20pcs: 7cm*2mm 20pcs: 8cm*2mm 5pcs: 9cm*2mm 5pcs: 10cm*2mm 5pcs: 12cm*3mm Package includes: 1 box of 225pcs O-rings