Disc Top Caps Color : all different color for your choice . Size : 18. 20, 24, 28410/415 Material : plastic ; aluminum Packaging :The standard export carton (inner packing: shrink wranp , outer packing :carton) protective packing. Your specific request for packing is acceptable. The outside of the cap also can be metalized , it is looked very beautiful . If necessary, we would like to send samples so that you can test them. Any requirement,you all can ask us.