1,weight:100g,180g. 2, 4 color 3, it can rub off chemical substance,such as tar or asphalt and will not hurt the surface. Question and AnswersQ - What is surface prep or clay bars?A - A synthetic material very similar in consistency to firm Playdoh. Usually palm size, made by most top manufacturers of car care products.Q - How do clay bars work?A - These synthetic bars grab and shear contaminates ...