Field Logic Rage 2 Extra Blades are 1.5 inch replacement blades. These blades are expandable and have a SlipCam rear blade deployment system. The stainless steel instant cut tip and aircraft quality aluminum machined body make these blades durable and high quality. HexFlat design is for stable flight and they fully deploy before they enter. The ShockLock system holds each blade in place with the use of O-ring. 3 Pack.