Appointed as an alternative to compare. Design roles, I realized that this is the opp. To the design-R. have integrated a brake roll away. What bothers me, because who does not want his chair sometimes roll unrestrained and "non-food" through the apartment. For security-loving people who are afraid to creature comforts and out of respect for the "time to put next to" maybe but usable.
Qaulität's see. With the alternative hard floor rolls of Topstar well. The tread is made of rubber, are not noisy and supple on the ground.