Please note: Due to the wide range of sizes and variations in HDPE and silicone moulds, we keep only a limited stock. If you need more than is available, place an order and they’ll be made within 2–4 days. Our HDPE moulds are CNC machined from 12mm sheets of smooth HDPE for accuracy and to ensure they are leak-free. As with all HDPE sheets, there is no protective film (like with acrylic or perspex), so minor cosmetic marks or scratches may occur and could show on the finished casts. Some sanding and polishing might be needed.