Hi-Qua Badminton String Protection Pads - Approximately 50 pads per bag. Protects the outer strings. Absorbs vibration. Enlarges the sweet spot. Reduces string tension loss. Attaching to the 12 o'clock position of the racket head makes smashes heavier. Attaching to the 3 and 9 o'clock positions of the racket head makes the face less likely to wobble, making it easier to receive with a stable face. Approximately 3g per bag (one color), approximately 50 pieces. Length 1.5 cm, width 0.5 cm, hole pitch 0.7 cm. Insert between the grommet and the frame. Remove the grommet and attach underneath. Compatible with rackets from any manufacturer. Customer feedback on the protection pads: I compared two identical rackets, with the same strings and tension, with and without the pads. Immediately after stringing, I didn't notice much difference, but after 1-2 days, the racket with the pads clearly showed less tension loss and better repulsion. I will purchase the pads along with 2.1 mm grommets and attach them to my other rackets. Thank you for this wonderful product. Please comment other than lowering the price as it is already the lowest price.