This is a Five Pound Package of Marblex Pottery Clay from American Art Clay Co. FEATURES: A self-hardening clay for all hand methods of modeling. Gray in color. Air-dried pieces are hard and durable, but not waterproof. In moist form, it is ready to use, no kiln or oven firing is necessary. INCLUDES: One 5 Lb. Package of Marblex Pottery Clay. SPECS: Weight: 5 lb. (2.27kg) sdw 6/25/01 ir/jl