DA Tempering Roller MoldStix and Stones Concrete DA Tempering Roller Mold was developed in collaboration with powerlifter and inventor Donnie Thompson to support body tempering as a heavy duty upgrade over traditional foam rollers, utilizing weighted cylinders to break up trigger points and relieve tightness in the joints, muscles and fascia. This mold follows in that same idea with affordable concrete. With proper use, this mold allows the user to make as many rollers as