These nipple clamps hold well, are cleanly made and easy to use.
The opening of the clamps can be adjusted from 0 to 10mm with a screw. This also allows the contact pressure to be adjusted to suit your taste.
The black protective caps are welded to the clamps and do not come off. If you want it to be even harder, you can cut them off with a sharp knife.
The pulling weight consists of 3 parts, each weighing approx. 50g. 2 parts are connectors with a thread and screw side. The 3rd part is an end piece with a continuous thread.
Thanks to this combination, the pulling weight can be adjusted to suit your personal preference. With a second pair, each weight can be extended by 2 connectors.