Blackline Adjustable Open Wide Nipple Clamps by Spartacus.

Adjustable wide alligator nipple clamps are great for large nipples that need a wider than usual tip. The wide, rubber-tipped tips distribute the pressure from the clamp, making them good for somewhat gentler play. But don't be fooled the thumbscrews can adjust the clamps to a very strong grip. All-black clamps and black link chain provide a classic fetish look. Non-piercing nipple clamps with broad ends tipped in black rubber for comfort.