Designed specifically to fit high angle larger tubing swivel footing, the heat shrink 6328 Flexi-Felt® model is the perfect solution for some of the newer furniture or those classroom where if it's not bolted to the ground kids will break it. The only floor protector in the industry that has a lifetime warranty against removal. I don't care if the kids use their hands, their feet or their teeth! This is not coming off. Chairs remain stackable.