Specifications: XXD A2212 1000KV brushless outrunner motor: KV: 1000 Max. efficiency: 80% Max. efficiency current: 4-10A (>75%) Current capacity: 12A/60s No Load current @ 10V: 0.5A No. of cells: 2-3 Li-Poly Motor size: 27.5 * 27mm / 1.1 * 1.1in Shaft diameter: 3.17mm / 0.1in Weight: 48g / 1.7oz 30A Brushless ESC: Output: Continuous 30A, burst 40A up to 10 Secs. Input voltage: 2-4 cells lithium battery or 5-12 cells /NIMh battery BEC: 2A / 5V (Linear mode). Max speed: 210,000rpm for 2 poles BLM, 70,000rpm for 6 poles BLM, 35,000rpm for 12 poles BLM. (BLM: Brushless Motor) Size: 45 * 24 * 11mm / 1.8 * 0.9 * 0.4in Weight: 25g / 0.9oz Item total weight: 480g / 1.06 Package List: 4 * A2212 1000KV Brushless Outrunner Motor with Mounts 4 * 30A Build-in BEC 2A Brushless ESC 4 * Pairs of 1045L/R Propellers (Black)