Descriptions: The cage and ring are locked together with the lock. Once the lock is locked there really is no escape (unless you have the key). Features: : Material:polycarbonate cage The length of cage: 75mm （as picture） the inner length of cage: about 35mm Size of ring Ring is adjustable: maximum 52mm minimum 35mm Package Includes: 1 polycarbonate cage 4 locking pins with spacers 1 brass padlock 5 individually numbered plastic locks Privacy Protection: Product information won't be shown in the package or customs declaration. Contact US: We are professional seller, will offer you good sales service. If you have question about our product or service, please send message To US. We will reply you as soon as possible. Feedback: If you are satisfied with our product, please leave full-star and good feedback for us.Your Feedback will encourage us to do better and better. Thanks! Base ring size measurement and choose method Take a inelastic line to surround the root of penis (the place is close to the belly, behind the scrotum), and then measure the length of the line, which is the perimeter, and the diameter equal to the length of Line divided by 3.14. Finally choose the base ring size near to the diameter. To avoid injury or aggravation of pre-existing conditions, this product should not be used on bruised, swollen, or inflamed areas including skin lacerations. Discontinue use immediately if irritation or discomfort occurs. Cleaning: Use a mild soap and soft type brush (toothbrush) for cleaning.