Hybrid Plastic/Rubber Polymer Clay; Remains Flexible After Curing Shatterproof and Damage Resistant High Strength; Blends With Ease Stays Soft Until Baked; Does Not Air Dry Made In The USA ; Conforms to ASTM D-4236 Safety Standards; Non Toxic. Give your fantastic creations an added effect with this specially formulated glow in the dark flexible clay! Accentuate jewelry, wings, fangs, horns, and so much more with light activated green & blue luminescence. This special color is easily workable right out of the box: not too soft, but not too firm. As with all Cosclay grades, our Cosclay ELEMENTS Glow has high green strength, blends with ease, and will not sag in the oven.