Professiona or home use. No poution, no radiation, no , environmenta protection Heavy-duty rubber rings can be used in app ications requiring higher resistance and higher temperatures than NBR. Suitabe for Automotive, Automotive, Garage, Pumber, , Workshop, Repair, Air and Gas Connections, Automotive, Doors and , App iances, Bearings, Pumps, Carriages, etc. Vehices, Appiances, Accessories, Air Conditioning Manifolds and moreThe O-Ring Kit is packaged in a bayonet cear pastic case for identification purposes. Assortment O-Rings with convenient resealable plastic case Total 18 most popular used O-ring Sizes Hydrogenated Nitrile Butadiene Rubber (HNBR), also known as Highly Saturated Nitrile () is special class of nitrile rubber (NBR) and is for mission critical applications HNBR can be formulated to meet application temperatures ranging between -45 degrees C and 165 degrees C, and HNBR is by ASTM as -type polymer Rubber 18 popular sizes Material: Rubber Color: Quantity: 225pcs rubber O-ring Type size: 18 sizes (as shown in the picture) 225pcs Sealing ring: (Quantity & Size) 20 Pc - 3 x 1mm 20 Pc - 4 x 1mm 20 Pc - 4.5 x 2mm 20 Pc - 5 x 2mm 20 Pc - 6 x 2mm 20 Pc - 6 x 2.5mm 20 Pc - 6 x 3mm 20 Pc - 7 x 2mm 20 Pc - 8 x 2mm 5 Pc - 9 x 2mm 5 Pc - 10 x 2mm 5 Pc -12 x 3mm 5 Pc - 13 x 3mm 5 Pc - 14 x 2.5mm 5 Pc - 17 x 2.5mm 5 Pc - 18 x 4mmSealing ring 5 Pc - 20 x 2mm 5 Pc - 22 x 2mm Package Contents: 1 Set * Rubber O-Rings (225pcs) 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.