Even if the is struck in precisely the same manner, the effect of the nap will differ according to whether the ball is directed towards the baulk line or towards the opposite end of the table. A snooker ball set consists of twenty-two unmarked balls: fifteen , six , and one white cue ball. The six colours are one each of yellow, green, brown, blue, pink, and black, although the brown and blue balls were not a part of the original rules. Each ball has a diameter of . At the start of the game, the red balls are racked into a tightly packed equilateral triangle and the six colours are positioned at designated on the table. The cue ball is placed inside the "D" ready for the shot. Each player has a cue stick (or simply a "cue"), not less than in length, which is used to strike the cue ball. The of the cue must only make contact with the cue ball and is never used for striking any of the reds or colours directly. Snooker accessories include: for the tip of the cue, used to help apply on the cue ball; various sorts of , such as the or for playing shots that are difficult to play by hand; for lengthening the cue stick; a for the reds; and a which is typically attached to a wall near the snooker table. A traditional snooker scoreboard resembles an abacus and records the scored by each player for the current frame in units and twenties, as well as the frame scores. A simple scoring bead is sometimes used, called a "scoring string" or "scoring wire". Each segment of the string (bead) represents one point as the players can move one or several beads along the string. Rules Objective A player wins a frame by scoring more points than their opponent. At the start of a frame, the are positioned on the table as shown in illustration A. Starting with the cue ball in the "D", the first player executes a break-off shot by striking the cue ball with the tip of their cue, aiming to hit any of the red balls in the triangular . The players then take alternating at playing shots, with the aim of a red ball into a pocket and thereby scoring one point. Failure to make contact with a red ball constitutes a ,