Real stone and natural aggregates. Universal Scale. Also available in 1/2-gallon size (SE0876). PLEASE NOTE: WE RECOMMEND WHEN PREMOISTENING CINDERS TO ADD RUBBING ALCOHOL TO "WET WATER" SOLUTION TO BREAK DOWN THE SURFACE TENSION: (1-qt. water & 2 teaspoons dishwashing liquid and 1 cup rubbing alcohol). CAUTION: Use caution when mixing the rubbing alcohol so as not to inhale the vapors. CAUTION: THIS MATERIAL MAY CONTAIN NATURALLY OCCURRING METAL PARTICLES WHICH INTERFERE WITH TRACK OPERATIONS AND ELECTRICAL SYSTEMS. ADHERE WITH MATTE MEDIUM. ONCE DRY, PASS A STRONG MAGNET CLOSELY OVER APPLIED AREA TO PICK UP ANY METALLIC PARTICLES!