Thank you for my e-mailI want to sell the sketch book binding machine. . We are the manufacturers. Our machine uses a plastic coting steel'Can not use plastic coil. Review the spec of the machine.Made in s-korea --------------------------------------------------------------------------------Sketch book binding machine ( for selling) Please,see our book binding machine. -Auto punching binding machine. -Single spiral binding machine. -Stationery machine. -Punching & binding machine. -Perfact binding machine (JUST ONE)., -Make sketch book & exercise book