Rubber protects vinyl or laminate flooring from scratches. The wheel tire is softer, non-marring silicone appropriate for rolling on a hardwood floor. Shelf top roller on track design maintains maximum vertical and horizontal shelf stability.

Easy to install, sturdy. Now the island is movable. Came with all the mounting hardware i needed.

It works, rolling smoothly under my diy cart. They're very well made, roll effortlessly, the locks hold and are easy to engage and disengage.

Double lock (swivel and rolling lock) allows the stand to be very stable. Especially like how the swivel locks with the wheel. Setting channel locks to the right leverage point and levered them back open.

The bearings seem very smooth. The wheels are a good compound and seem like they might last for awhile.

Rating says 150 lbs per caster. The cart is about 150 lbs total.