Made withe the same engineering process as our other gear sets - stainless steel tube(5 mm), music wire( .078") and captured in polyurethane resin. The only difference is no SS oleo reveal. The complexity of the original gear design transfers to the 1/32 gear and as a result increases labor costs. Guaranteed to hold up to the toughest treatment, however, trying to land your plane on the driveway from the roof voids all warranties, expressed or implied!).