Question: What is the average weight of squash balls?
About the article "Squash (sport)", section "Playing equipment".

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The features of squash ball machines are modeled after the rules of squash and the constituency of squash balls.
Squash is a ballgame that is played by hitting a ball with a racket against a wall, similar to a backboard, so that the ball bounces off the wall.
The opponent player has to hit the ball back against the wall without letting the ball bounce more than once.
The game can be played either by two people (the "singles" version), or by four people (the doubles version), in either a smaller court (singles and softball doubles) or a larger one (hardball doubles).
The balls used in squash are small rubber balls that can differ in terms of diameter, weight and softness.
These features determine the speed and bouncing amplitude of the ball, with softer balls being generally slower than the harder balls.
The temperature of the ball also affects the amount of bounce: the warmer the ball, the more it bounces.
Because cold squash balls have little bounce, the squash balls are hit multiple times at the beginning of a game to warm them up.
It also means that a game becomes gradually faster as it advances and that softer balls may be too slow to be used in colder climates. 
Balls used in urban golf vary relative to each organization and context.
Although real golf balls are used in some circumstances where risk from injury is low, other balls used are Tennis Balls, Squash Balls, almostGOLF Point3 balls (used by Urban Golf associations throughout Belgium), Air Flow Balls, Cayman Balls and many types of adapted or customized balls.
Shoreditch Golf Club produces and manufactures its own design of ball specifically for this game. 
Squash South Africa is recognised as the South African National governing body of the sports of Squash. 
Irish Squash Federation is recognised as the Irish National governing body of the sports of Squash. 
Standard racquets are governed by the rules of the game.
Traditionally they were made of laminated wood (typically ash), with a small strung area using natural gut strings.
After a rule change in the mid-1980s, they are now almost always made of composite materials or metals (graphite, Kevlar, titanium, boron) with synthetic strings.
Modern racquets have maximum dimensions of 686 mm (27.0 in) long and 215 mm (8.5 in) wide, with a maximum strung area of 500 square centimetres (90 sq in), the permitted maximum weight is , but most have a weight between 90 and 150 grams (3–5.3 oz.
Squash balls are between 39.5 and 40.5 mm in diameter, and have a weight of 23 to 25 grams.
They are made with two pieces of rubber compound, glued together to form a hollow sphere and buffed to a matte finish.
Different balls are provided for varying temperature and atmospheric conditions and standards of play: more experienced players use slow balls that have less bounce than those used by less experienced players (slower balls tend to "die" in court corners, rather than "standing up" to allow easier shots).
Depending on its specific rubber composition, a squash ball has the property that it bounces more at higher temperatures.
Squash balls must be hit dozens of times to warm them up at the beginning of a session; cold squash balls have very little bounce.
Small colored dots on the ball indicate its dynamic level (bounciness), and thus the standard of play for which it is suited.
The recognized speed colors indicating the degree of dynamism are:
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Some ball manufacturers such as Dunlop use a different method of grading balls based on experience.
They still have the equivalent dot rating, but are named to help choose a ball that is appropriate for one's skill level.
The four different ball types are Intro (Blue dot), Progress (Red dot), Competition (single yellow dot) and Pro (double yellow dot).
The "double-yellow dot" ball, introduced in 2000, is the competition standard, replacing the earlier "yellow-dot" ball.
There is also an "orange dot" ball.
Players wear comfortable sports clothing.
In competition, men usually wear shorts and a t-shirt, tank top or a polo shirt.
Women normally wear a skirt or skort and a t-shirt or a tank top, or a sports dress.
The National Institutes of Health recommends wearing goggles with polycarbonate lenses.
Many squash venues mandate the use of eye protection and some association rules require that all juniors and doubles players must wear eye protection.