This set of double six dominoes are jumbo tournament professional size. They measure 54 x 27 x 12mm. (approx 2" x 1 " x .47"). They feel perfect in small or large hands and are made of high density resin, a material with outstanding strength, stiffness and optical clarity. They feature a center spinner for easy mixing and come beautifully packaged in a striking dovetailed sheesham wood box.