Michael Yeh on Twitter: "Unsure who invented this solution, but adoption has been universal. I wonder if the tennis balls actually come with the walker? @GomerBlog @medicalaxioms https://t.co/Li3lRbRMs9" / Twitter
Amazon.com: Drive Medical 10121 Walker Tennis Ball Glides, Yellow : Health & Household
Pack of 4 Tennis Balls for Walker Legs for Seniors Yellow | eBay
Drive Medical Walker Rear Tennis Ball Glides 10121 - The Home Depot