This product ensure high quality standards through 3 times quality checks, while regrettably still come across defective products occasionally (Arm hair clipping and defective adapters). Please Note 1. Don't recommend you use this Milanese band with daily desk work (or frequently rub with the desk surface), also our team is trying to make it better; Love your bands, enjoy your life. 2. The magnet of the clasp is very strong, no problem with most sports.