The brake was missing from one blade
Response from Sport Leader
Thank you for your kindly feedback. My name is Fish from Cycling and In-line Skate Team.
According to your question, the brake is missing from one blade. Originally the roller is designed a brake for one blade. Normally we will use only one brake when we are playing roller.
Here is my email, firstname.lastname@example.org, don’t be hesitate to contact us if you have any question. Cheers.