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 making them slightly smaller than the squares on the board. Only the rosewood tiles of the deluxe edition varies the width up to for different letters. Travelling versions of the game often have smaller tiles (e.g. ); sometimes they are magnetic to keep them in place. The capital letter is printed in black at the centre of the tile face and the letter's point value printed in a smaller font at the bottom right corner. S is one of the most valuable tiles in English-language Scrabble because it can be appended to many words to pluralize them (or in the