Ceramic Tumbling Media 4 Lbs. 3/8" X 1/4" Triangle Non-Abrasive This is a porcelain media that has no abrasive in it. It is used to polish all materials. It can be used as a second step or used alone when only a polish is required. Can be used in all types of equipment. *** Caution *** I would not recommend using this product when brand new for the polish stage. Before using, I would recommend running the media in the tumbler with water for a few hours to smooth out any sharp edges.