These aren't the best clamps, but they're not that expensive either. The rubber on the jaws isn't very strong, so be careful not to fail if you're clamping something that can cut through the metal frame. Although he did his job well.
Pros
Anti-Slip Tip: Features a PVC coated tip for a soft yet secure grip, suitable for any type of surface. The anti-slip tip provides extra grip on the jaws of the clips, making each clip more comfortable.