| http://www.w3.org/ns/prov#value | - See all 172 customer reviews They are durable plastic, clearly strong plastic, with a very comfortable grip.Dustin FarahnakMy use of them has been upon carpeted surfaces; the rubber and hard plastic bottoms might not be quite so effective upon wood or other flooring.rsoonsaIt really takes a lot of strain off of your wrists, and make getting up and down so much easier.Son of Sonny
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