Collection: Gifts for Teenagers

Teching Inline Four-Cylinder Stirling Engine kit That Works Aluminum Alloy Model Collection

Teching Galileo Pendulum Clock Full Aluminum Alloy Stirling Engine Model

Teching Inline Four-Cylinder Full Aluminum Alloy Assembling Model Science Education Engine for Collection

TECHING Build Your Own Inline 4 Cylinder Internal Combustion Assembled Engine - Used Engine

SkyMechman NTR-900 Building a 1/30 Turbofan Engine Model Kit - Build Your Own High Bypass Engine Nacelle that Works

Building a 1/20 Working Jet Turbofan Engine Model Kit Silver