Using these neck - to - wrist restraints is easy. First, adjust the collar to fit around your partner's neck comfortably. The collar can be adjusted from 12.5' to 16.5' in circumference. Then, adjust the wrist cuffs to fit their wrists. The cuffs are adjustable from 7.5' to 10' in circumference. You can use the large O - rings to attach ropes or other bondage accessories for more creative play. When you're done, make sure to clean the restraints with a toy cleaner. This will help keep them in good condition. Store them in a cool, dry place, away from direct sunlight. Always communicate with your partner during play to ensure everyone's comfort and safety. These restraints are for adult use only, so keep them out of reach of children.