Model No.: wk-ws-12-003 Specification: 1). Dimension: Φ12 X 22mm 2). Speed constant(KV): 11000 RPM/V 3). No-Load Current: ≤0.7A 4). Working voltage: 3.2-4.5V 5). Shaft extension: 4mm 6). Shaft diameter: Φ1.5mm 7). Weight: 10.4g