I got this roller ball shower curtain hooks after years of my kids pulling the shower curtain with all their might from one side to the other which inevitably ends in the hooks getting twisted, or worse, the hooks falling down along with parts of the curtain. When I switched to these roller ball hooks, the curtain magically never got stuck on the rod again and all complaints stopped from both the kids and me. The tiny balls allow for much smoother motion on the rods and my wife likes the modern look of it and how well it coordinates with our bathroom.