Autobondabge Ice Ball lock – 70mm ball made by stainless steel, The Ice Castle works on the principle of melting ice. It’s perfect for self bondage. Simply fill it with water, insert the 2 stick, the excess water comes out. Then place it in the freezer compartment. There is a hole in the outer tube that prevents the lock from being blown up by freezing water. Capacity approx. 250ml. The opening time depends on the ambient temperature, this lock opens after about 2h30min at a temperature of 20 ° C. The two eyelets at the ends are for attaching ropes