We always work hard to ensure high quality standards through 3 times quality checks, while we regrettably still come across defective products occasionally, so if you have anything about the quality of your items, please kindly let us know. There are the steps to contact seller: Sign in your amazon account - choose "your orders" - find that order - click "contact seller" on the right side. The magnet of the clasp is very strong, no problem with most sports, if your bands does not work good, please kindly contact us for your warranty replacement.

• Strong magnetic clasp, convenient for you to adjust the size; Ensure your watch in steady and secure, no problem for most sports
• Personalize your iwatch with this refined strap compared to apple ones, but less price
• No hassle, super easy to remove the old one and replace with this one
• Top stainless steel mesh loop in an elegant color
• We are happy to send out a replacement band if your band has any quality issues, please kindly let us know

Strong magnetic clasp, convenient for you to adjust the size; Ensure your watch in steady and secure, no problem for most sportsNH Tech