1200 PCS & 24 DIFFERENT SIZE: This O rings kit contains most all needed O rings size(24 sizes),from 6mm to 28mm,and 1200 pcs quatity.Can effectively prevent leaks in fuel or water plumbing, machinery, hydraulic, and auto repair.Better to meet your different needs in and work. WIDE APPLICATION: This nitrile rubber metric O rings works great on electronic equipment,pipes,carburator repair,tap faucets,pumps, DIY home repair,sensors,trucks,cars,boat,engines, spray , pressure ,pneumatic connection,etc. secure seals for any oil,gas,air,and water seal application. EASY STORAGE: Come with a sturdy box, not easy to .Each size of O-ring has a storage grid, which will not mess up the size to help you better storage.The convenient packaging box allows you to it conveniently in a tool box or tool bag and take it to anywhere it is needed. QUALITY: It has good resistance to oil, water,high temperature and high pressure resistance.Operating temperature range is -40Celsius(-40Fahrenheit) to +120Celsius(+248Fahrenheit ). It has good compression, abrasion resistance and elongation.High adhesive content,fine trimming, high elasticity, no obvious smell. use and more durable. colour:Black Material:Nitrile rubber Package Contents: 100 x O Ring 6mm x 1.5mm 100 x O Ring 6.5mm x 1.5mm 100 x O Ring 7mm x 1.5mm 100 x O Ring 8mm x 1.5mm 100 x O Ring 9mm x 1.5mm 100 x O Ring 10mm x 1.5mm 100 x O Ring 11mm x 1.5mm 100 x O Ring 12mm x 1.5mm 50 x O Ring 13mm x 1.5mm 50 x O Ring 14mm x 1.5mm 50 x O Ring 15mm x 1.5mm 50 x O Ring 16mm x 1.5mm 20 x O Ring 17mm x 2.4mm 20 x O Ring 18mm x 2.4mm 20 x O Ring 19mm x 2.4mm 20 x O Ring 20mm x 2.4mm 20 x O Ring 21mm x 2.4mm 20 x O Ring 22mm x 2.4mm 20 x ORing 23mm x 2.4mm 20 x O Ring 24mm x 2.4mm 10 x O Ring 25mm x 3.1mm 10 x O Ring 26mm x 3.1mm 10 x O Ring 27mm x 3.1mm 10 x O Ring 28mm x 3.1mm Only 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.