Activity & Learning Toys

TBRICKFUNR Steam Engine Model Kit, Mini Horizontally Opposed Four Cylinder Steam Engine with Gearbox for Small Steam Model Ships Without Boiler, Physics Experiment for Adults Dual-Gear Functionality: Features a piston-type slide valve structure, miniature stainless steel crankshaft, bearings, brass gear transmission, and a complete reverse gear mechanism High Efficiency & Low Power: Optimized for small boilers (50-100mm)... TBRICKFUNR Steam Engine Model Kit, Mini Horizontally Opposed Four Cylinder Steam Engine with Gearbox for Small Steam Model Ships Without Boiler, Physics Experiment for Adults