Very good quality.
By K. Li
"Very good quality. Can feel your heels sink in comfortably and makes a difference to a stand up desk set up compared to simply standing on a hard floor. "Sticks" to the floor to prevent sliding and the chamfered edges minimise risk of tripping on it. Good size which, despite looking big on paper, is really the right size for standing up on and having some space to move around on without feeling restricted."