This case has a strap that can be added (awesome - I just loop it around a belt loop whenever I walk out of the door and never worry about falling out of my pocket) and the two part design with tape in the top cover keeps the case on while still allowing the case to fully open. Very very strong adhesion. 1 or 10 are not for you. Size up. These were an infant 5! Worth for the price. 5 grams, but the corresponding weight the anti-skate must be set to is closer to 2 grams on the dial based on a blank disc skate test. totalement Génial! I can game for 12-14 hours without them actually dying on me. if you are over size 10 I would stay away.