RC4WD 540 Crawler 27 Turn Brushed Motor. 

Features:

• Custom Made 540 Steel Case
• Chrome Plated Case
• Build in Capacitor for Minimizing Glitch
• High Torque Magnet and Rotor
• Small Footprint (50mm long)
• Tuned for Rock Climbing and Scale Driving
• Polished Bushings

Specifications:

• Body OD: 1.39in / 35.5mm
• Length: 1.96in / 50mm
• Output Shaft Length: 0.43in / 11mm
• Output Shaft OD: 0.12in / 3.1mm
• Min and Max Voltage Range: 2.4V-30V
• Weight: 5.57oz / 158g
• (At No Load) RPM @ 7.2V: 15000 +10% , 1.2Amp Current
• (Rated load) RPM @ 7.2V: 13600 +10%, 5.02Amp Current
• Designed Operating Temperature Range: -10°C to +60°C
• Shaft end play: 0.1mm to 0.5mm
• Noise Level: < 78DB