MATERIAL & SIZE:Kiln Stilts Made of refractory ceramic fiber,it is an excellent refractory material,high temperature ,eco-friendly and ,Mat size-. DESIGN:Mat designed as a square shape,features multi holes on to help insert or remove the pins onveniently,equipped with 60 removable and replaceable pins, aim to securely support ceramic or pottery pieces and hold them in place without sliding during a kiln firing.