This first name initial pop out cell phone accessory is the best smartphone gift idea. A cute Birthday present. A cute smart phone holder knob for women, men, teens, boys, girls, teenagers, and females. A cool and cheap cellphone Christmas gift idea with a neat alphabet script font. Adhesive backing attaches the PopGrip to your case or device. Will not stick to silicone, leather, waterproof, or highly textured cases. Works best with smooth, hard, plastic cases. Not compatible with wireless charging Printed top is swappable with other compatible PopGrip models. Just press flat, turn 90 degrees until you hear a click and remove to swap.