This part is made from 24 gauge steel and finished with high-temperature black stove pipe paint.   ⚠ Warning: California Proposition 65 Use of this product can expose you to chemicals including soot, creosote, wood dust, and wood smoke containing carbon monoxide, which are known to the State of California to cause cancer, birth defects, or other reproductive harm.  For more information, visit www.P65Warnings.ca.gov.