Review on CasterMaster 3X3 Square Rubber Furniture Caster Cups with Non-Slip Floor Grip (Pack of 4) by Brian Campbell

We had to replace our office chair. Our 95 lb dog uses it to stand and look out the front window. He takes it very seriously and doesn't appreciate it when the chair moves every time he jumps in. It was a safety issue and he stopped jumping in his chair. He was unsatisfied. We put them under the chair hoping it would stop the chair from moving across the wooden floor. Success! Our dog can look out the front window again and we don't have to worry about the chair (and dog) sliding across the floor. - They were used on the back of a chair. We had to use a different model for the front round legs.