Hedman Hedders was the first manufacturer to introduce advanced aerospace technology to the hedder industry. The alloy of ceramic-metallic composition used by Hedman, now known as HTC (Hi-Tech Coating), was and still is considered the very best thermal coating available for your hedders. HTC is bonded to your hedders with a strength factor exceeding 10,000 PSI. This durability makes the finish resistant to abrasion and chipping. Oil and grease stains can be removed with polish or fine steel wool. HEDMAN'S HTC COATING IS GUARANTEED against external rust-through for a FULL 5 YEARS. Together with Hedman's Lifetime guarantee against defects in workmanship, you will have years of worry-free hedder ownership.