Standard 12" x 18" Single - 12 Gauge Replacement Blade. Gauge:12. Anode: No. Back Plate: No. WARNING: This product can expose you to chemicals including di(2-ethylhexyl)phthalate (dehp) which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.