The compact design a perfect fit for all arm sizes, no more worried for searching the right arm size. You can quickly write down the 's course of fire and make notes on ranges, elevation drop, wind drop, and target location, etc. Tip: Use a wet-erase marker (not a dry-erase). NOT Just For Tactical: Also can be used in any sports. Two clear can add three card, you can have all the information you need right on your wrist. PERFECT FOR ALL SPORTS - Not only can the Wristband used for football, but it can also be used for others sports like basketball, soccer, , tennis etc. AND COMFORTABLE - The Wristband is made of cotton and so that it can handle all environments and can be comfortable for the player! A heavy duty Nylon Sticker closure ensures it never leaves your wrist! EASY TO CLEAN - Machine washable and dryable so you can get out stains! Colour:Black Material:cotton Package Contents: 1 * rugby tactical wristband Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.