Marion & Co. jumbo double nine black professional size domino measure 56 x 28 x 12 mm. (2.2" x 1.1" x .47"). They are made of urea, a raw material used in the manufacturing of many plastics. The dominoes are packaged in heavy Arcadian paper chipboard box. The box is manufactured in the U.S. The chipboard is made from recycled materials and is recyclable. The double 9 set of 55 tiles come with a center spinner for easy mixing. These dominoes feel perfect is small or large hands.