Enough to Replace: you will receive 4 pieces of heart rate monitor replacement bands in black, enough to meet your daily use and replacement needs, no heart rate monitor included | Adjustable to Fit You Well: the fitness monitor band is about 0.8 x 14.2 inches/ 20 x 360 mm, flexible and adjustable, you can adjust the length to fit your arm well, ideal for most women, men, boys and girls to wear | Not Easy to Tear: made of reliable nylon material, the heart rate monitor strap is sturdy and dependable, friendly and soft, not easy to fade or scratch your arm skins, credible to accompany you for a long time | Good Compatibility: our heart rate monitor replacement strap is practical, lightweight and compact, compatible with most heart rate sensors; You can choose a suitable length based on the hole, which will not move on your arm, but not so tight that it brings you uncomfort | Widely Applied Outdoors and Indoors: the heart rate monitor replacement band can be worn either on the wrist or on the arm, suitable for many activities, such as rock climbing, cycling, jogging, yoga, running and mountain climbing, to enjoy sports