The closure is an internal lock which is removed when opened with the key. 2 keys are included. The A-ring comes in a new curved shape. It therefore adapts much better to the man's anatomy. It is also available in 3 different sizes. Inside there is a removable flex tube for the urethra. The front part has Ø 8mm. The hose has a diameter of 6mm and is approx. 13cm long and has a continuous hole. The inner diameter of the cage is 33mm. The length approx.: 45mm. The total length with A-ring approx. 75mm. The material is stainless steel. The total weight is approx.: 165 grams.