Professional Grade Tire 12 pc. 4" string. Sold in lots of 6 of the 12 pc packs. Self vulcanizing plugs need no extra lube or rubber cement. If you have bought my Heavy Duty Tire patch and plug repair kit already, contact seller for a special deal on these replacement plugs. Will work with any "T" handled tire patch tool, but works SUPER GREAT with the split handle in the kit sold in my other auctions. THIS IS FOR 72 TOTAL PLUGS !!!!!!!!!