Scrabble of points for each lettered tile is based on the letter's frequency in standard English; commonly used letters such as vowels are worth one point, while less common letters score higher, with Q and Z each worth 10 points. The game also has two blank tiles that are unmarked and carry no point value. The blank tiles can be used as substitutes for any letter; once laid on the board, however, the choice is fixed. Other language sets use different letter set distributions with different point values. Tiles are usually made of wood or plastic and are square and thick,
Scrabble letter distributions the letters "B", "E", "N", "O", "P", "S", and "U". The letter "C" was reduced in value to 5 and the "X" was increased to 10: Circa 1961, the hyphen was dropped from the game's name, and the original Swedish distribution of the game had been restored. Sometime later, produced under BRIO's subsidiary, Joker, the number of "T"s in the set were reduced by one and an 8-point "Z" tile was added. In 2002, under the ownership of Mattel and its brand name Scrabble, the Swedish language set tile values of the "C" and "Z" were changed, respectively, to 8