ERA Mini 4" Arms - For Action Cam Builds 4-inch replacement arms for ERA Mini and ERA Mini O4. If you're flying with an action cam, the extra arm length gives you bigger props and more thrust to handle the weight properly. When You Need These Action cam builds are heavier. 3.5" arms work great for lightweight setups, but if you're strapping a Naked GoPro/ DJI Osmo Nano/Action 2 on top, 4-inch arms and bigger props make a real difference in how it carries the weight. When You Don't Flying O4 Pro only? Stay on 3.5". The stock arms are sized for that. Compatibility Direct fit for ERA Mini & ERA Mini O4 Motor Mounting: 12x12mm (M2) - not compatible with 9x9mm motors Not compatible with ERA 5" or ERA 5.5" DC Includes 4x 4" arms - 4mm T700 carbon fiber
