ITEM NAME:Hobbywing SkyWalker 40A Brushless Speed Controller With UBEC for RC GGD.40A Brushless Long wire. Highest speed: 210,000 RPM of 2-pole motor, 70,000 RPM of 6-pole motor, 35,000 RPM of 12-pole motor;. BEC output: 5v@3a (linear regulator mode);. Material: Glass fiber. We want to make sure you are happy with our item.