Fancy Drape Mold - Fusible Glass Slumping Mold Mold measures approx. Interior: 8.25" L x 8.25" W x 3.25" H. To use, simply pretreat the mold with kiln wash or nitride spray, and drape 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 and formula sheet for figuring the proper size of your initial glass blank included!