These props are ideal for 4' ripper or racing quad enthusiasts. The propeller diameter is 4 inches, with a pitch of 4.3 and 3 blades. They're made of polycarbonate, weighing 2.24g. The hub diameter is 13mm, hub thickness is 5.7mm, and the shaft is 5mm. There are no adaptor rings. Comes in a 4-pack with 2 clockwise and 2 counterclockwise props. Choose your color and take your quad to the next level.