Product specification Material: 65 manganese, high hardness, good corrosion resistance and high temperature resistance. Product surface treatment: Oxidation blackening. Product colour: Black Size: ¦Õ8--50pcs, ¦Õ10--40pcs, ¦Õ12--30pcs, ¦Õ14--25pcs, ¦Õ16--20pcs, ¦Õ18--20pcs, ¦Õ20--20pcs, ¦Õ22--20pcs, ¦Õ24--20pcs, ¦Õ26--20pcs, ¦Õ28--10pcs Scope of application: Cylinders, automobiles, valves, electrical appliances, spraying, doors and windows, bearings, machinery, etc. Note: Please check the product size on the picture and the product specification in the description before purchase to make sure you get what you need, thanks! Package includes:11 kinds of total 275 pieces of C-type internal retaining rings, these products will be packed in a sturdy and clear plastic box that can be used as a storage box. This box is labelled with the size of the gasket to make it easy for you to find it quickly when you need it, and the box can also help you store these gaskets when you dont need them normally, so they wont get lost easily.