Luncheon Salad Bowl - Fusible Glass Slumping Molds Mold measures approx. 4" D x 2" H. To use, simply pretreat the mold with kiln wash or nitride spray, and deep slump a pre-fused glass blank onto the mold. For best results, always elevate this mold off the kiln shelf by at least 1" before firing. Comes with a complete New Hampshire Craftworks slumping and care schedule included.