These nipple clamps are phenomenal. I love them so much and will be using them daily. I am into pain/pleasure and it's always nice to experiment. I definitely recommend these nipple clamps to moderate/advanced users. Beginners can have fun with these if they start slowly. This item, for the price, is definitely worth it. I couldn't be happier unless they were heavier, but you can always tie things to them. They do not come off if tugged and it does leave you sore the next day; it's a good thing.