Professiona or home use. No poution, no radiation, no , environmenta protectionHeavy-duty rubber rings can be used in appications requiring higher resistance and higher temperatures than NBR.Suitabe for Automotive, Automotive, Garage, Pumber, Mechanic, Workshop, Repair, and Gas Connections, Automotive, Doors and Windows, App iances, Bearings, Pumps, Carriages, etc. Vehices, Appiances, Accessories, Conditioning Manifolds and moreThe O-Ring Kit is packaged in a bayonet snap-on cear pastic case for identification purposes.Product DescriptionAssortment O-Rings with convenient resealable plastic case 18 most popular used O-ring SizesHydrogenated Nitrile Butadiene Rubber (HNBR), also known as Highly Saturated Nitrile () is special class of nitrile rubber (NBR) and is for mission critical applicationsHNBR can be formulated to meet application temperatures ranging between -45 degrees C and 165 degrees C, and HNBR is classified by ASTM as DH-type polymerRubber 18 popular sizesMaterial: RubberColor: PurpleQuantity: 450pcs Purple rubber O-ringType size: 18 sizes (as shown in the picture)225pcs Sealing ring: (Quantity & Size)20 Pc - 3 x 1mm20 Pc - 4 x 1mm20 Pc - 4.5 x 2mm20 Pc - 5 x 2mm20 Pc - 6 x 2mm20 Pc - 6 x 2.5mm20 Pc - 6 x 3mm20 Pc - 7 x 2mm20 Pc - 8 x 2mm5 Pc - 9 x 2mm5 Pc - 10 x 2mm5 Pc -12 x 3mm5 Pc - 13 x 3mm5 Pc - 14 x 2.5mm5 Pc - 17 x 2.5mm5 Pc - 18 x 4mmSealing ring5 Pc - 20 x 2mm5 Pc - 22 x 2mmPackage Contents:2 Set x Rubber O-Rings (225pcs)Only the above package content, other products are not included.Note: Light reflection 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.