(1) Unisex Chrome-plated Light Metal Restraints Rings 2 Pieces with Magnet Locking Pins (M Size).
It has one O-rings for attachment to chains, ties or other bondage gear. Means you can securely lock your sub to the toys of your choice.
The inside diameter of this M Size is 6.0 cm, the width is 2.0 cm.
(2) The weight of this item is approximately 380g.