MAYAIYIN 4PC Pinion Gear Set for Small RC Quadcopters This 4piece pinion gear set is designed for compact RC aircraft and rotor systems. The gears are sized to fit certain X5C, X5A, and X5 platforms and 720 coreless electronic starter configurations, providing a precise and reliable drive for miniature quadcopters. Key benefits Precise gear engagement: The pinion gears are sized to match compatible rotor drive systems, helping maintain smooth power transfer and stable rotor operation. Readytouse spare set: Four pinion gears in one package provide convenient replacements for field repairs or routine maintenance. Brand confidence: Made under the MAYAIYIN name, offering a compact solution for small RC aircraft accessories. Key attributes Package: 4 pieces Pinion specification: 0.9 teeth Outer diameter: 1 mm Compatibility: X5C, X5A, X5 platforms and 720 coreless electronic starter configurations Application: Small RC quadcopter rotor gear Brand: MAYAIYIN Compatibility and compatibility notes Designed to fit small quadcopters and related rotor gear systems listed in the product title. Suitable as a replacement or spare part for maintenance and repairs of compatible X5C/X5A/X5 models and 720 coreless electronic starter setups. Use cases Spare parts for X5C/X5A/X5 quadcopters: worn pinion gears after routine use or gear mesh issues to restore smooth rotor drive. Field maintenance: Carry a small pack of pinions for quick onsite repairs during hobby flights or club sessions, reducing downtime. Notes This product focuses on providing the listed pinion gear specifications and compatibility as stated in the original product title. No additional features or materials are added beyond the described specifications. MAYAIYIN small RC quadcopter rotor gear pinion set offers a compact, practical solution for maintenance and hobby builds, aligned with the specified models and configurations in the product title.