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