Item Type: 4 Blades Propeller_x000D_ Model: XR-150_x000D_ Material: ABS_x000D_ Purpose: Suitable for DIY toy accessories remote control car model_x000D_ Outer Diameter: Approx. 100mm / 3.9in_x000D_ Inner Hole: Approx. 2mm / 0.08in_x000D_ Blade Quantity: 4 blades 14 Blades Design: These propellers are designed with 4 blades, with high wind and thrust, and good performance. 2With 2mm Hole: The outer diameter is 100mm with a 2mm inner hole, suitable for a motor shaft with a diameter of 2mm. 3Durable Material: Made of ABS plastic, resistant to impact and abrasion, not easy to deform after long term use. 410Pcs in 1 Set: The kit contains 10pcs 4 blades propellers, which are small in size, easy to install and do not take up space. 5For DIY Toys: Commonly used in DIY toys, such as remote control boats, power car models, etc.10 x Propeller