Sold by Pervana Corporation. Licensed by State of Calif. Board cosmetologynWater Proof, fulll head bond,easy clean up, safe for lace hair piecesnPro Flex is not the correct name for this product but sellers here on Amazon altered the name to corner the sales. The ONLY manufacturer of this tape is called Walker Tape Co. with name being "EXTENDA BOND" tape. or "AIR FLEX TAPE" . All other names are generic tape made by Copy-Cats not made in the U.S.A. All our products are manufactured only in the U.S.A. This tape will give you very strong hold. Manufacturer claims 4 weeks hold. I personally get 2 weeks as well as most my clients.