These are 39 mm diameter Professional weight & size Casino chips. 11.5 grams in weight, they are produced from a clay composite resin and an insert that gives them the weight & feel of a heavy casino quality chip. These are the heaviest & best casino chips on the market. They are great for Texas Hold'em, blackjack, roulette, or any other type of gaming! The poker chip case is made of durable aluminum, and the interior is covered by black velvet (the stuff they use for poker tables). This durable aluminum will keep your chips off dust and spill and protect your chips for a life time. The case has protected edges for even more durability.