Marion & Co. Black Double 9 set of dominoes has 55 tiles and is made of urea, a raw material used for the manufactuirng of high quality plastics. Marion & Co. jumbo tournament professional size domino measures 56x28x12mm (2.2"x1.2"x,47" These dominoes come with a center spinner for easier mixing. Marion & Co. Double 9 Dominoes come handsomly cased in a Sheesham Wood Box with beautiful dovetail joints, as used in fine furniture. Jumbo size dominoes feel perfect in small or large hands. Their white spots on the black tile make them easy to read.