Upgraded PCB: The advanced upgraded PCB is tailor made for steam trains, providing higher performance and reliabilityCompact Size: 1:87 ho scale circuit board compact size of 5.5cmx1.8cm/2.17inchx0.71inch makes it great for a variety of train modelsBuilt in Resistor Function: The PCB Board is equipped with built in resistors to ensure optimal current flow and protect your model train components, thereby increasing their lifespan and efficiencyDurability: Made of quality metal materials, this railways trains circuit board is sturdy and resilient, making it a reliable choice for enthusiasts looking to upgrade their model trainsAccessories: Easily upgrade your electric steam train model with this ho scale train accessories, which is designed to provide performance in a compact form factor Specification: Material:Metal Size Chart: 5.5cmx1.8cm/2.17inchx0.71inch Package Includes: 1 Piece 1:87 HO Scale Railways With Resistor Note: 1.This is not infant toy , please take away from children to avoid eating.2.Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.