NSP (Non-Sulfurated Plasteline) is a line of professional, sulfur free sculpting clays. Removing sulfur minimizes difficulties associated with mold making with silicone rubber. Can be melted and poured at approximately 185°F. With three hardnesses to choose from, the NSP line can be used in multiple situations and with several sculpting styles and needs. Each hardness is available in green and brown color. Each block is 2lb of clay and is priced at $5.70/lb. Quantities of 20 blocks (40lbs) or more are eligible for bulk pricing, just $5/lb.