DjuiinoStar Vehicle Engine Model Assembly Kit (300+ Pieces Components, 5 Hours Assembly Time), Four-Stroke Straight-Four Gas Engine Working Model, 4 Cylinder Engine Kit DM13-1

DjuiinoStar Vehicle Engine Model Assembly Kit (300+ Pieces Components, 5 Hours Assembly Time), Four-Stroke Straight-Four Gas Engine Working Model, 4 Cylinder Engine Kit DM13-1

Sunnytech Low Temperature Stirling Engine Motor Steam Heat Education Model Toy Kit For mechanical skills (LT001)

DjuiinoStar Heavy Duty Gyroscope (Solid Stainless Steel Rotor): Initial Speed 8,000 RPM, Sturdy and Stable; Provides Very Good Gaming Experience; High-End Office Toy, Addictive Science Gear DG-5PRO-01