✓Two Size Available: Small size for 5.5" - 7.1" wrist, Large Size for 7.1" -8.7" wrist. Size can be adjustable with buckle. ✓Multi Choices: Various Colors can dress up your colorful life. Multipack bands can also be mixed wearing, and create your own unique style. ✓Buckle + Notch Design: the buckle is made of Stainless Steel, easy to assemble and resize. Besides, there is a notch under the ring, can double hold your band securely in place and secure the extra length of Charge 3 Bands. ✓Premium Waterproof Material: Bands Replacement Compatible with Fitbit Charge 3 / Charge 3 SE / Charge 4 is made of flexible elastomer waterproof material. Sweat and water resistant, lightweight and easy to dry, great choice for swimming etc. Durable premium material can prevents skin from irritation. Very soft and comfortable to wear. ✓Wepro Bands Replacement Compatible with Fitbit Charge 4 / Charge 3 / Charge 3 SE only, no Charge 4 or Charge 3 device included.