Ancient astrologers attributed gems to bring wellness and good fortune each month of the year. We celebrate today with jewelry, crystals, and even Thinking Putty®. The stunning array of hues from the magical jewels in Birthstone Thinking Putty® can bring focus and peace. hinking Putty® helps build hand and finger strength through a fabulous tactile play experience with unique, unexpected properties and provides relaxing, yet stimulating interaction for anyone with sensory integration issues. Crazy Aaron's putty is non-toxic, won't dry out, and won't leave a sticky or slippery residue on your fingers, so it's great for stretching, molding, bouncing, tearing, popping and playing by kids and adults alike. For Ages 3 and up. WARNING: CHOKING HAZARD - Small Parts. Not for children under 3yrs.