The basketball team consists of 12 players (of which 5 are located on the field ) . Reserves may enter the game in exchange for the approval of a judge competitions ( during a break in the game) . The team can make unlimited changes of its composition, the fact that the duration of a shift may not be longer than 20 seconds , regardless of the number of players changed . Players must have uniforms and numbers on the jerseys from 4 to 15, marked with a contrasting color . It is advisable that the numbers were placed in the back ( higher ) and front ( smaller ) .