Welcome to our store! 1. Cultivate children's practical and thinking abilities, and let them develop a good habit of learning. 2. Belongs to the physics science teaching apparatus, making teaching more vivid. 3. Can be used with 2x2 mm carbon fiber rod, with a wide range of applications. 4. Made of high-quality ABS plastic material, durable in use. 5. Safe and environmentally friendly, rest assured to use. Item Type: Coreless Motor + Propeller Material: ABS Plastic Suitable Age: 7-14 Years Coreless Motor Model: 716, 720, 8520 (Optional) 1 x Propeller 1 x Coreless Motor 1 x Motor Sleeve 2 x Gear 1 x Gear Shaft 1 x Plastic Pad 2 x Metal Stopper Your 100% satisfaction is our top priority. We will provide you with the best service. If you find any problems after receiving the product, such as damage, incorrect quantity, etc., please contact us immediately and we will give you the best solution!