Transform your DIY vehicle projects with these versatile pull back motors! This set includes 4 high-quality gray technical building blocks that are compatible with popular building systems. Each motor unit features an inertia-powered mechanism that brings motion to your custom creations. The robust design includes multiple connection points for seamless integration into your builds. Perfect for adding realistic movement to cars, trucks, and other motorized constructions, these pull back motors measure approximately 6x5x3 units. The inertia power function provides reliable mechanical motion without the need for batteries or electrical components. Ideal for both beginners and advanced builders looking to enhance their technical projects with dynamic movement capabilities. These components are designed for durability and repeated use, making them essential additions to any serious builder's collection. Compatible with parts 12787c01 and 12799, these motors seamlessly integrate into existing building systems for expanded creative possibilities.