740 Pieces 24 Popular sizes rubber O-Ring kit ,Covers most commonly used sizes,meet almost all your needs.the sizes are labeled so you know exactly what size they are. a great assortment of O-ringsWell made orings: Built of commercial grade Nitrile Butadiene Rubber (NBR) material for against UV, lubricants and greases,Heat and abrasion resistant.Easy to use: Stored in a labeled and organized case, easily choose sizes you need; Sturdy storage case is better for organization and portability.O-ring gaskets seal and prevent water leaks in faucets, sinks, filters, toilets, plumbing and machinery. Fits many applications: garages, general plumbers, mechanics, workshop, car, door, window, electric appliance, bearing, pump, rollerhouse and boat... A good kit for general repairsColour:BlackMaterial:rubberPackage Contents:740 * rubber orings1 * plastic case1 * size noteOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.