Model TLC is extremely corrosion-resistant. Both the inner liner and outer casings are constructed of 304 stainless steel. Embossed couplers do not allow moisture to penetrate the chimney's outer wall. Sections simply twist-lock together and are secured with Locking Bands. The Model TLC product line features deluxe chimney support components that will enhance any installation. Black trims are used to embellish the chimney support component parts that may be installed inside the home.