Compatible models and note - Silicone strap with a metal buckle, designed for Fitbit Versa 4, Fitbit Sense 2, Fitbit Versa 3, and Fitbit Sense. Please check size and model to avoid purchase errors. Material and build quality - The strap is made of high-quality silicone with a stainless steel buckle and spring bars at both ends. The metal buckle is durable, corrosion-resistant, and easy to wear. It is non-irritating, soft, and skin-friendly, combining practicality with a refined appearance. Size, fit, and color options - Adjustable length with a metal buckle for easy resizing to your wrist. Suitable for wrists from 5.5 to 8.7 inches, accommodating small to large wrists. - Available in 15 colors, many suitable for both men and women, as well as teens. The strap is interchangeable, offering versatile style options. Installation and maintenance - Both ends of the silicone strap are equipped with spring bars, so no additional parts are required. Easy to install and practical for daily use. The strap is fashionable, durable, and reliable for long-term wear. Use scenarios - Gym and workouts: secure, comfortable fit during exercise with a soft, skin-friendly surface. - Everyday wear: suitable for office or daily activities, offering a clean, professional look. - Outdoor and travel: durable construction and easy adjustments make it a practical choice for outdoor adventures or trips.