The CB-3000 is sized mid-way between the CB-2000 and The Curve. It represents the natural lines of the penis. It is completely transparent which makes it very intriguing while worn. The slope makes it virtually undetectable under clothing. The material is a highly durable polycarbonate, vented with slots for hygiene when bathing. The cuff ring is included in five sizes: 1 1/2�€�, 1 5/8�€�, 1 3/4�€�, 1 7/8�€� & 2.0�€� and spacers are provided for an individual fit. The cage portion has an inside length 3�€� and inside diameter of 1 3/8�€�. The cuff ring goes behind the ball sack and over the penis. Install the locking pin and the spacers. Put the cage over the penis and then line up the cage portion with the cuff ring. Slide the guide pins and locking pin into place and attach a lock on the tip of the locking pin. Once you have found the exact fit, cut the ends of the guide pins with a pair of side cutter pliers and smooth the edges with an emery board. You should be able to wear it 24/7 for indefinite periods of time...1 month, 3 months...wearer and Keyholder ultimately determine the period of time! The CB-3000 includes five individually numbered plastic locks, one brass padlock with two keys, three different sized locking pins and five different sized spacers. THE SUPPLIER DOES NOT SELL EXTRA INDIVIDUAL KEYS, THEY ARE NOT KEYED ALIKE!! Choose from clear or black.