From: Trim-Tex Inc.
Angle Master by Trim-Tex is a 3.25-in.-wide flexible corner trim engineered to fit any angled corner. Made of a paperless vinyl material that holds its shape and will not mold, the corner trim features Mud Lock Technology—consisting of microscopic hooks that increase the total surface area of the trim for the strongest bond to the drywall—to keep corners free of cracking. To install, simply press Angle Master into place, clean excess compound and let dry before applying a skim coat and final sanding. It comes in a 100-ft. roll, and one box contains four rolls.