South Beach Rectangle Serving Dish Set - Fusible Glass Slumping Molds Molds measures approx. 12" L x 6" W x 1" H (medium) and 8" L x 4" W x 1 " H (small). For best results, always elevate this and all fusible and slumping molds at least 1" off the kiln shelf or floor before firing. To use, simply pretreat the mold with kiln wash or nitride spray, and slump your prefused or sheet glass (cut to size) using the included slumping kiln schedule. Comes with a complete New Hampshire Craftworks slumping and care schedule included!