More durable, using high-toughness PC material, anti-collision, long service life More flexible, more agile, more violent Higher efficiency and more delicate Compact size, exquisite appearance Compatible with for POPO system Quantity:2 x positive propeller, 2 x reverse propeller Diameter:5 inch Center thickness:7mm Center hole inner diameter:5mm POPO Applicable motor:2207-2306 1800KV-2020KV Due to different batches, the printed words on the product will be different, which does not affect use. Colour:A:Red/B:Purple/C:Blue/D:Gray Material:PC<br><br>Package Contents: 2 Pairs * Propellers (2CW+2CCW) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.