Features: --(NBR, Buna-N) Nitrile rubber O-ring is the most widely used O-ring material in the world. Good water tightness, heat resistance and wear resistance, excellent oil resistance, corrosion resistance, high pressure resistance, good mechanical properties, no pollution, no odor. --NBR O-ring, suitable for engineering, household pipes, automobiles and other fields; can be used for water seals, oil seals, shaft seals, fixed seals, hole seals, rotary seals, etc. --This product contains small parts, please do not let children play freely to prevent accidental swallowing. --Assortment O-rings with convenient resealable plastic housing. --There are 24 most commonly used O-ring sizes. Description: Name: Rubber O Ring Assortment Kit Scope of application: automobiles, machinery, decoration, electrical appliances, cylinders, bearings, pumps, water pipes, valves, doors and windows, spraying, rollers, chemical pipelines Properties: high temperature resistance, wear resistance, corrosion resistance Packing list:  6x1.5mm x 100PCS 6.5x1.5mm x 100PCS 7x1.5mm x 100PCS 8x1.5mm x 100PCS 9x1.5mm x 100PCS 10x1.5mm x 100PCS 11x1.5mm x 100PCS 12x1.5mm x 100PCS 13x1.5mm x 50PCS 14x1.5mm x 50PCS 15x1.5mm x 50PCS 16x1.5mm x 50PCS 17x2.4mm x 20PCS 18x2.4mm x 20PCS 19x2.4mm x 20PCS 20x2.4mm x 20PCS 21x2.4mm x 20PCS 22x2.4mm x 20PCS 23x2.4mm x 20PCS 24x2.4mm x 20PCS 25x3.1mm x 10PCS 26x3.1mm x 10PCS 27x3.1mm x 10PCS 28x3.1mm x 10PCS Note: This product contains small parts, please do not let children play freely to prevent accidental swallowing! Due to manual measurement, please allow 1-3 cm error, thank you. Due to screen and other objective reasons, there may be a certain color difference, please understand.