Frame material
The material from which the racquet frame is made. Today, two solutions are the most popular: aluminium alloy and carbon (graphite).
Aluminium alloy is the simplest, most affordable and reliable solution, which, however, is not very popular in modern sports. The advantage of aluminium rackets is a long service life and good resistance to mechanical damage — it is quite difficult to break it on the court. Most often used in the production of children's rackets.
Carbon (graphite) is the most popular material for the manufacture of tennis rackets today, both professional and amateur levels. It boasts low weight and good strength. Quite rarely rackets are made of pure carbon, more often various metal alloys (carbon, titanium, etc.) are used, and each manufacturer has his own “recipe” for an perfect alloy.
String surface area
There is a simple pattern here: the larger the area of the string surface and the lower the rigidity of the string tension, the higher the impact force and the lower its accuracy. This parameter is directly related to the string formula.
Now on the market there are rackets with the following string surface area:
Midsize (452 – 574 cm²),
Midplus (580 – 677 cm²),
Oversize (710 – 742 cm²).
String formula
A string formula is a scheme for stretching racquet strings. Represents two numbers: the first of them is the number of longitudinal strings, the second is the number of transverse ones. A racquet with a lower string density will provide more power, while a higher density racquet will provide better ball control. It is important to pay attention to the fact that the same string formula on rackets with different head area will provide different stiffness. For example, a racquet with a Midplus head and a 16x19 formula will be stiffer than a similar model with an Oversize head.
Weight
As the weight of the racquet increases, the impact force increases, but its accuracy decreases. On the contrary, it is easier to swing
with a light rocket, but at the same time the player needs to make more effort to give the ball the desired speed.
