This very soft, sulphur-free modeling clay is also ideal for use by the professional sculptor or novice. It will not deteriorate with age, is not sticky or greasy and will not crumble. Tan and Gray blocks are supplied in 1 lb. wrapped packages, each measuring about 1" x 3" x 5-5/8". Green blocks are supplied in 2 lb. packages, each measuring about 2" x 6" x 6".
Additional Information: MSDS | Freeman page