Strait-Flex Perfect-90 is a laminated drywall corner tape that is twice as fast, twice as strong, and requires half the sanding and half the work of traditional drywall tapes. It is perfect for professional inside 90-degree corners and flat butt joints. The composite laminate ensures straight corners with no blistering or edge cracks, and it spans common gaps in drywall without shrinkage. The polyurethane-laminated center ensures perfect corners without paper fuzz-up during finishing and sanding, and the diamond-punched 94 lb.