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.
Changes directions smoothly. Unlocking them can take a lot of force. I usually whack the lever with a mallet and that does the trick. They are economical compared to other 3-inch casters.
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