Material: Forged aluminum Recommended age: 14+ Designed for DLE-55RA engine Includes piston, rings, and wrist pin Compatible with RC airplane gas motors The DLE55RA piston kit is engineered for the DLE-55RA engine.It is constructed from forged aluminum to support in RC airplane gas motor applications.The piston rings and wrist pin are designed to provide proper fit, reduce friction and wear, and support long-term engine.This kit serves as a replacement or upgrade for the DLE-55RA engine.Installation is designed to be straightforward and ensures correct fitment for the DLE-55RA engine.The kit does not require batteries or electronic components.It is compatible with various RC airplane gas motors.This item is a third-party substitute.Use of brand names is limited to indicating which devices it supports.