But seriously, I'm pretty sure the opposite is true - they want to sell rubber walker feet but folks use tennis balls instead because things that aren't medical devices are cheaper than things that are (especially since you can use old, dead tennis balls)
But seriously, I'm pretty sure the opposite is true - they want to sell rubber walker feet but folks use tennis balls instead because things that aren't medical devices are cheaper than things that are (especially since you can use old, dead tennis balls)