Dunlop Biomimetic Revelation 135

Head (size) and shape of the head

Rackets have different shapes and different sizes of heads. When it comes to the shape of the head, there is no clear assessment of what shape is ideal and recommended for the appropriate group of players. Most of the heads are in the shape of a "classic egg". There are clearer classification rules for the size of the racket head. The size of the racket head is given in centimeters and / or square inches and refers to the surface area. The surface of the racket head is responsible for the force and precision of the strike.

There are three basic sizes of racket heads:

• Midsize (small) - 85-93 square inches
• Midplus (medium) – 94 – 103 square inches
• Oversize (big) – above 104 square inches

Summarizing, it can be assumed that:

• Beginners - should pay attention to heads with a size from 660 cm² (102 square inches)
• Intermediate people - heads of size 645-690 cm² (100-107 square inches)
• Advanced people - individual selection, but rather, these are heads with an area 645 cm² (100 square inches) i mniejsze.

The arrangement of strings (tension) of the racket

The most popular arrangement of strings is the arrangement (vertical / horizontal ratio): 18/20 and 16/19. There are also other layouts such as: 18/19, 16/18, 14/18 and others. Due to the density of the string arrangement, there are two basic arrangements: open "open" (a rare arrangement of strings, e.g. 16/19) and closed "close" (dense 18/20 string arrangement)

The string system (tension) is open

1. more ball power but less control,,
2. greater deformation of the impact surface,
3. gives the ball more spin because the ball has more contact with the tension,
4. they have a negative effect on the durability of the string (due to the easy movement of the strings in the racket, they are rubbed faster),
5. lower "stiffness of the string system,
6. larger "sweet spot" - clean hit field,

Closed string system

1. less strength and more control,
2. less deformation of the surface of the impact of the racket and thus lower dynamics of the game,
3. longer string life (you need to replace it less often because it has a lower tendency to break). This is due to the fact that the "dense" string cannot move relatively freely,
4. less "rotation"
5. smaller "sweet spot" - clean hit field

Recommended tension force

Racket manufacturers provide the recommended tension force, measured in kilograms, with which they recommend stringing rackets with a tolerance of +/- 2 kg. Tighter strings in the racket give more control of the ball, but reduce strength, dynamics and rotation. Increasing the string tension also makes the game less comfortable, as more adverse effects from hitting the ball will be transmitted through the racket frame to the player's body generally. Weaker racket string tension reduces ball control (the catapult effect is often cited). However, we will achieve greater dynamics of strokes and rotation, because the ball stays on the strings longer and "bites" more into the racket.

Racket weight

This is a very important factor in choosing the right racket. The weight of the racket for an adult player may vary between two hundred and three hundred grams.

Summarizing, it can be assumed that:

• Beginners - should look for lighter rackets weighing 270-290 grams (men), 250-270 grams (women),
• Intermediate people - should pay attention to rackets weighing 280-300 grams,
• Advanced people - choose rockets that exceed three hundred grams with the option of individual "weighing" of the rackets through the use of lead tapes attached to the frame.