This is an improved version of the Press Chamber / Ball Flask sold at many shops. Of course none of them is like this one! It can "host" even the largest balls and it has many unique features: it is LOCKABLE, so it is perfect for punishment in a domination game. If Master or Mistress wants low hanging balls, the slave can not resist: a padlock or plastic numbered lock keeps his ball weights in place. Crushing function with safety: the flask has 3 **control slots**, so it can be seen as the crusher progress with every turn!, Weight: 1.7kg It's crusher piston can be changed to a steel cap with rope hook, which gives further bondage options Control slots: the flask has 4 control slots, so it can be seen as the crusher progress with every turn! The inner diameter of the flask is 65mm (2.55"), inner diameter of the lockable ring is 38mm (1.4") Even the largest balls can fit in! 100% Stainless Steel