Thanks for your coming and wish you a happy shopping here.<br><br><b>Band Material:</b><br>We use a custom high-performance Silicone with breathable air holes, soft, comfortable, breathable yet durable. That Magnet pieces will lock your iWatch interface precisely and securely, avoid falling off. The Pin-and-tuck closure ensures a clean fit, and you’ll only take a few seconds to replace. Metal parts are made with hypoallergenic nickel free stainless steel, which can prevent your skin from irritation or allergy.<br><br><b>Band Size:</b><br>38mm/40mm, Small Suitable for 5.1"-7.1" (130mm-180mm) wrist<br>38mm/40mm, Large Suitable for 5.5"-7.5" (140mm-190mm) wrist<br>44mm/42mm, Small Suitable for 5.9"-7.9" (150mm-200mm) wrist<br>44mm/42mm, Large Suitable for 6.3"-8.3" (160mm-210mm) wirst<br><br><b>100% Satisfaction Customer Service:</b><br>Here you will get a 100% Satisfaction Customer Service for any quality issues anytime.<br><br>