Features: -Aeronautic Aluminum Alloy & CNC Processed. Each cap weighs less then 2g, hardly affects flying endurance. - Aluminum alloy covers have good thermal conductivity and will not affect heat dissipation of motor. -Protect motors from dust, moisture and scratches during transportation. - No Need for Repeated Assembly And Disassembly. Not affect propellers installation. No need to dismount the caps for later use. Specifications: Name: Sunnylife Aluminum Alloy Motor Cover Model: AT-MD475 Material: Aluminum Alloy Net weight: 8g(4Pcs/Set) Gross weight: 18g Packing size: 64*64*18mm