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 ur 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 ur bands does not work good, please kindly contact us for your warranty replacement.
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