The Double Six Standard Dominoes Set by CHH is a classic tile game with a strategy theme, making it a fun and engaging choice for both boys and girls aged 6 and up. This set of 28 dominoes is perfect for 2 to 4 players and comes in its original black vinyl travel case, making it convenient to take on the go. Whether at home or on the move, this game is sure to provide hours of entertainment and competition for players of all ages The set is called "double-six" because the highest value tile hars six pips on each end. Dominoes can be made of various materials, this set is likely made of plastic.