This is a handmade Poly Plastic Mold made to use with resin, but, can also be used with other mediums. Food Safe plastic. Made from Durable Thick Plastic to withstand the test of time. *************************************************************************** This is a 30 x 40mm Bow setting with a 30 x 40mm Dome cab If pieces come out not shiny, simply coat with resin or resin spray. That is what I do with all of my pieces anyway. *************************************************************************** You do not need mold release with these molds, but, some say it may help. Do not put in the oven. **************************************************************************** Feel free to contact me with any questions.