Crazy Aaron's Thinking Putty Hypercolor Mini-Tin Set (4) with FREE Electric Ruby Super fast shipping - arrives in 4 business days or less! Set contains four 2" mini-tin styles (with . 47 oz. Putty each). The hypercolors change color from the heat of your hands. Hypercolor: twilight (deep purple shifts to fluorescent blue)  hypercolor: sunburst (vibrant orange shifts to bright yellow)  hypercolor: chameleon (tropical green shifts to fluorescent yellow). Note: exclusive! Electric ruby (dazzling, sparkling, iridescent) has a much firmer consistency than the hypercolors. Made in the usa of non-toxic silicone that never dries out and is easily removed from solid surfaces (avoid carpet, fabrics, hair, etc. ).