Is this Universal Hand Strap Can Damage the back side of my iPhone?

Hi There! I would like to buy this discounted universal hand strap though I am afraid with the thought that it might create few scratches on the back side of my iphone. What do you think guys? Thanks.

via iLounge Forums http://forums.ilounge.com/accessories-iphone-ipad-ipod/278528-universal-hand-strap-can-damage-back-side-my-iphone.html