HDPE Plastics are ideal for a wide range of uses, including modelling, prototyping , mould making etc. 15mm thick, usable material 300mm X 300mm Piece sizes are around 350mm with screw holes in the corners. Usable material would be 300mm X 300mm square. We buy the sheets in 2000mmX1000mm cut out what we need and are left with these squares. All material is new and unused but sheets are lightly sanded. Huge saving on new material price We have over 200 peaces so please get in touch to see what we can offer on larger quantities.