qibylift Pull Up Bar Thick Bar Adapter, Weight Grip Bar Fit for Standard Barbell - Dumbbell Handle Grips, Silicone Rubber Barbell Grips for Weight Lifting Cable Attachments & Fitness Training

It says it's "made from high-density silicone rubber". Feels as hard as plastic. "Will not compress or slip". Not being able to compress (too rigid) is the problem - and yes it's so rigid on the inside its slips on the knurled bar handle. A 1-inch bar has a circumference of 3-inches - for me, too small. The "fat grip" takes the circumference to 6-inch - which in my opinion is at least 1-inch too much in circumference. You might as well be trying to hold on a to a thick (6-inch circ.) PVC pipe. For reference, a regular toilet paper roll has a 6-inch circumference. Everyone has these in their home to give you perspective - now imagine it had no "give" (compression). Would you feel you had a good grip to confidently hold 40, 60, 80lb dumbbells?"A thicker handle boosts your muscle stimulation". I actually totally agree with this statement. My forearms did get better stimulation "trying to hold on" to this grip. If the grips were low to medium-density, I think these would be perfect. Again....for me. If you have bigger hands, you might find these great.I will stick with my rolled up micro-fiber cloth and send these back.

Works great so far! Easy on/off to any bar really. Added them to a set of adjustable dumbbells and gives an added level of training to any lift.

They were a great price but didn’t work well with the dumbbells at my local gym.

Cheap way to increase strength with out increasing weight!

Better deal