Choose your kids initials or mix and match to create your personalised look. Charm dimensions: /- (25mm x 25mm) (1in x 1in) Charm comes with back button. Insert the button at an angle into the side holes on your waterproof sneakers. Be sure to select your placement before inserting, as the charms are designed with a snug fit in order to prevent kids from removing them. Warning: Chocking hazard. Small parts not for children under 3 years. Parental guidance is advised.