Badminton rackets are light, with top quality rackets weighing between about 70 and 100 grams (without strings). They are composed of many different materials ranging from carbon fibre composite (graphite reinforced plastic) to solid steel, which may be augmented by a variety of materials. Carbon fibre has an excellent strength to weight ratio, is stiff, and gives excellent kinetic energy transfer. Before the adoption of carbon fibre composite, rackets were made of light metals such as aluminium. Earlier still, rackets were made of wood. Cheap rackets are still often made of metal, but wooden rackets are no longer manufactured for the ordinary market, due to their excessive weight and cost.
There is a wide variety of racket designs, although the racket size and shape are limited by the Laws. Different rackets have playing characteristics that appeal to different players. The traditional oval head shape is still available, but anisometric head shape is increasingly common in new rackets.
Strings
Badminton strings are thin, high performing strings in the range of about 0.65 to 0.73 millimeters thickness. Thicker strings are more durable, but many players prefer the feel of thinner strings. String tension is normally in the range of 18 to 36 lbf (80 to 130 newtons). Recreational players generally string at lower tensions than professionals, typically between 18 and 25 lbf (110 N). Professionals string between about 25 and 36 lbf (160 N).
It is often argued that high string tensions improve control, whereas low string tensions increase power. The arguments for this generally rely on crude mechanical reasoning, such as claiming that a lower tension string bed is more bouncy and therefore provides more power. An alternative view suggests that the optimum tension for power depends on the player:[12] the faster and more accurately a player can swing their racket, the higher the tension for maximum power. Neither view has been subjected to a rigorous mechanical analysis, nor is there clear evidence in favour of one or the other. The most effective way for a player to find a good string tension is to experiment. Playing at high string tensions can cause injury, depending on the player's ability: few amateur players can safely play above 30 lbf (130 N), and for most players even 25 lbf (110 N) is too high.
Grip
The choice of grip allows a player to increase the thickness of his racket handle and choose a comfortable surface to hold. A player may build up the handle with one or several grips before applying the final layer.
Players may choose between a variety of grip materials. The most common choices are PU synthetic grips or toweling grips. Grip choice is a matter of personal preference. Players often find that sweat becomes a problem; in this case, a drying agent may be applied to the grip or hands, or sweatbands may be used, or the player may choose another grip material or change his grip more frequently.
There are two main types of grip: replacement grips and overgrips. Replacement grips are thicker, and are often used to increase the size of the handle. Overgrips are thinner (less than 1 mm), and are often used as the final layer. Many players, however, prefer to use replacement grips as the final layer. Toweling grips are always replacement grips. Replacement grips have an adhesive backing, whereas overgrips have only a small patch of adhesive at the start of the tape and must be applied under tension; overgrips are more convenient for players who change grips frequently, because they may be removed more rapidly without damaging the underlying material.
