About This 【PREMIUM NBR90 MATERIAL】 Made from high-quality Nitrile Butadiene Rubber (90 Shore A), providing superior oil, fuel, and chemical resistance for long-lasting durability 【20 COMMON SIZES】 Contains 20 of the most frequently used O-ring sizes (-011 to -924), ideal for automotive repair, hydraulic systems, air conditioning maintenance, plumbing, and industrial sealing 【MULTI-PURPOSE USE】 Perfect for sealing fuel injectors, AC fittings, hydraulic connections, water pipes, pumps, technicians, and DIY repairs 【HANDY PACKING】 988PCS O-ring kit with clearly labeled compartments for quick identification and selection, making repairs faster and more efficient 【CUSTOMER SERVICE】BUSY-CORNER always focuse on product quality and service. If you have any questions, please contact us Overview Material : Nitrile Rubber Brand : BUSY-CORNER Color : Black Temperature Range : -4E+1 Degrees Celsius Manufacturer : BUSY-CORNER