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 a "Y" it is worth 10 points, if a blank is used as a "Z" it is worth 15 points, and if a blank is used as a "K" it is worth 20 points. Each of those letters are so high in points, because they are used only in borrowed words. The score of 20 for a "K" is the highest known point value for any letter in any Scrabble score distribution worldwide. "Y" is absent in all sets except the paleographic extension of the first set because it is rare in Latin. "K" and "Z" are also absent in