WELL MADE ORINGS: Constructed with commercial nitrile butadiene rubber (NBR) material for UV, lubricant and grease resistance, resistant to abrasion. Sizes are labeled so you know exactly what size they are. a large variety of o-rings 740 Pieces 24 Popular Sizes Rubber O-Ring Kit, Covers the Most Used Sizes, Meet Almost All Needs. Easy to use: stored in a labeled and organized box, easily choose the sizes you need; The storage case is better for organization and portability. O-rings seal and prevent water leakage in faucets, sinks, filters, toilets, pipes and machinery. Fits many applications: garages, general plumbers, mechanics, workshops, automobiles, doors, windows, appliances, bearings, , carrier rollers, houses and boats … A good kit for general repairs, Weight: 0.48942622164 Pounds, Manufacturer: Rtxbvg