In the box you will find a pair of gel knee pads on the wheels. Knee pads are made of gel placed in plastic shell and equipped with a strap to attach it to your legs with a velcro. Straps are soft enough not to cause any discomfort when you sit on your legs and straps are squashed behind your knees. Kneeling is very comfortable, even for hours as thick gel provides the best cushioning. Unlike many other materials gel will never get compressed from hours of use so I expect that those pads will remain as comfortable for months and even years. You can use those pads without the wheels but the revolutionary idea behind this product is to provide ability to easily move around without getting up. Pads click into the solid, about 1/4" thick plastic wheeled base. That base allows you to easily roll forward, backward or even 360 degrees around. It is very comfortable and well balanced and of course makes you mobile so you don't have to constantly get up, which is very tiring if you have to spend long hours on the floor.
Apart from the comfort this product provides for the floor workers, I like that this product can be easily disassembled without any tools. That means that if any part would get broken you could replace it rather than be forced to buy the whole product. That means saving money for you and saving the planet for all of us.
Disadvantage of this product is its weight. Knee pads alone are actually very light - 28 oz or 800 grams per pair, but the whole product is a bit heavy 6 lbs and 2 oz or 2750 grams per pair. It doesn't matter when you are on your knees but if you have to get up and walk, you need to remove the wheeled base. It is quickly done by pushing one button. Walking with gel pads alone however is comfortable.