Permanent, waterproof and fadeproof. Marks on wet tyres or tyres covered with mold lubricant. Withstands vulcanizing and retreading temperatures. Also marks on wood, plastic, glass, etc. Nontoxic, contains no lead. 3/4" O.D. Sold 12 per box. Note: Myers Paintstiks have a marking range of -50º F to 150º F.