187 Killer Pro Derby Knee Pads – Black – Medium Review Posted by DustCrane February 20, 2018 in Protective Gear This fits your . Make sure this fits by entering your model number. 187 PRO DERBY KNEE PADS M-BLK BLK 187 Pro Derby Knee Pads Medium Black Black Skate Pads 187 Killer Pads Inline & Roller Skating Outdoor Recreation Skateboards & Scooters Skates Sports & Outdoors