Squash is a racket game played in an enclosed court. The object of the game is to keep the ball in play while making it difficult for the opponent to do so. The rules and court dimensions are standard with the exception of the USA and parts of Canada and Mexico.

The court
The dimensions of an international court are shown on the large diagram. The small illustration shows an American court.

The board or tin is a strip of resonant material running along the foot of the front wall. It is outside the playing area and makes a distinctive sound when hit.

The walls should be white or off-white and completely smooth. The door of the court should have a flush handle that will not deflect the ball.

Court markings must not exceed 5cm (or 1in in USA) in width and are painted red.

The floor is usually made of hardwood planks laid parallel to the side walls.

The racket
The head or shaft must not contain outside edges with a radius of curvature less than 2mm (0.08in). For safety string and string ends must be recessed within the racket head or be covered by a non-marking bumper strip. Damaged rackets should not be used. Strings should be of gut, nylon or substitute material, provided metal is not used. ISRF specification for weight is 255g.

The ball is made of rubber or a composition of rubber and butyl, and must have a matt finish.
ISRF specifications are:
weight 23.3-24.6g;
diameter 39.5-41.5mm.

The game of doubles is a North American invention and specifications for the court originate from the USA.
The ball is hard, not unlike American singles balls, but bouncier.                 http://www.nzsquash.co.nz