Note: The polyurethane epoxy resin I make to produce these blocks and blanks is far stronger than factory injection molded plastic. It is not molded by heating, melting, and pushing into a die and then freezing it. It is made by chemical reaction of two mixtures that turns from liquid to solid in the mold, at room temperature. Once the reaction takes place, the material is one solid piece of whatever color was selected. I mix and pour each order individually. The material is easier to cut, sand, carve, drill and polish than most of the natural materials it simulates, as well as being far stronger and more heat and solvent resistant. It is not "cheap plastic" like the typical mass produced thermoplastics. It is high strength ind;ustrial grade polymer like you might find on heavy duty roller cart wheels.