9 piece set includes: 1 double-headed brass brush; 1 double-headed copper brush; 1 double-headed nylon brush; 1 double-headed stainless steel brush; 4 double-headed polymer picks; 1 double-headed metal pick Universal Cleaning Kit The universal cleaning kit helps you remove carbon, dirt and debris Product details Our picks are designed to penetrate into small cracks and crevices. Stainless steel picks help clean stubborn areas. Polymer picks are for easy cleaning and to prevent scratches Applicable items Our brushes have a large head and a small head, which are used to clean all kinds of hard to reach places. The brass brush can easily remove hard carbon deposits and dirt on the bolt surface and gas piston. Copper brushes are usually reserved for cleaning the exterior. Nylon brushes are very suitable for trigger units, small parts and slide rails. In special situations, steel brushes can be used Use scenarios - Clean hard to reach crevices in mechanical assemblies and remove carbon deposits on bolt surfaces and gas pistons - Use copper brushes for exterior cleaning and nylon brushes for trigger units, small parts and slide rails - Use polymer picks for easy cleaning and to prevent scratches in delicate areas