5oz Tube Of Plastic Compound For Polishing Hard plastics. This is a new tube of plastic compound. Great for polishing hard plastics (not to be used on soft or low melting plastics such as polyethylene). Perfect for students, jewelers and crafters. Eliminates the mess and does away with broken bars. This peel back cardboard tube exposes only the amount needed. The tube contains approximately 5 ounces (141.7 grams).