Chinese Skates

These strap-on skate wheels were spotted, strapped on over the shoes of a pedestrian in Beijing China.

It appears that these skates use two inline style wheels that sit along each side of the ankle of each foot. They appear to raise the heel of each foot about an inch or two from the ground. The strap appears to secure the skate over the front top of each foot, over the shoe, near where the laces of the shoes are tied into a knot.

Anyone have any idea who makes them and what they are called.

I wonder how someone skates with these and how well people can skate with these apparent strap-on skakes