I will not be keeping these casters. They are made of rubber and the outgassing from this product is terrible. The gum smelled so bad when I first opened the box that I put it outside to try and air it out. It was of no use. Ever since I brought them indoors and attached them to my new coffee table, my house smelled like burnt rubber. The smell is so strong that you can smell it in the hallway of my apartment building.