s
Stiffy heavy-duty tube coupler stiffiners feature a deep spiral groove for maximum epoxy adhesion. These super heavy-duty wall stiffeners are designed to be epoxied inside of our standard tube couplers to greatly increase their lateral strength. Snapping off a payload at the joint under high-speed stress (as occurs when flying at or near Mach speeds) is not a worry when you fly with a Stiffy. NOTE: stiffys are not compatible with phenolic couplers.
TUBE COUPLER STIFFENER