Each team consists of 11 pieces, 10 field pieces, or buttons, in the form of small circular disks, and 1 goaltender piece in the form of a rectangular block. At the opening kickoff, all 11 pieces are relegated to their respective sides. Button are always circular in shape. Lower quality pieces are made of plastic and of a wide variety of diameters. Higher quality pieces are made of fiberglass, having a diameter of typically between 35 mm and 50 mm, and a height usually no greater than 8 mm. Nowadays, in formal games and tournaments, all buttons should be of the same material, color and size. Such standardization is decried by older players, as in their view it robs teams from variety and from similitude to real-life soccer teams. Buttons can be decorated with markings and numbers typical of a football jersey, as well as graphics of famous players or team logos, but no large diversity within a given team is allowed..