Dear Customers, We're Shenzhen Kaihongxin Plastic Mould Ltd , we make various of sound box for our clients . They're made of fire-proof plastic material, then rubber oil-painting on the surfaces. Shrinkage ,marks are not allowed . They have high request on the product apperance. If you have some electronic products need to open a new mould or injection processing , pls sent us your product drawings and exact requirements, we will reply you at once! Best regards, Cindy