They use our very successful InterFrame construction, tough, textured glass filled nylon scales over a 420J2 stainless steel liner InterFrame. We overbuild it for rigidity, using solid glass filled nylon back spacers. And we assemble the handle with superior offset Torx fasteners. The handle is exceptionally rigid and fills the hand perfectly. All models feature the Carson Flipper, which is not only an aid to opening the blade, especially when wearing gloves, but acts as a blade guard when the blade is open. We've also incorporated our patented AutoLAWKS.