NSP is a globally well-accepted sulfur-free material used by the Special Effects and Fine Arts industries. It holds exceptional surface details and is somewhat waxier and tougher than other Chavant products. Weight: 2 lbs per unit. Sulfur Free. NSP is a sulfur-free, somewhat tougher, waxier, sculpting Plasteline, used widely in Fine Arts and Special Effects. Can be melted and poured at approximately 185ºF. Additional Details ------------------------------ Product description: NSP is a globally well-accepted sulfur-free material used by the Special Effects and Fine Arts industries. It holds exceptional surface details and is somewhat waxier and tougher than other Chavant products. Weight: 2 lbs per unit. Sulfur Free. NSP is a sulfur-free, somewhat tougher, waxier, sculpting Plasteline, used widely in Fine Arts and Special Effects. Can be melted and poured at approximately 185ºF.