Big Horn 22126 White Strop Abrasive Bar. White Aluminum Oxide Bar for Strop Sharpening. The white bar is made of aluminum oxide powder in a wax base. It is used for rapid stropping of carving tools using either a leather strop or power strop or cloth buffer. The bar measures 1 1/4" X 1" X 5". The white bar will put a razor edge on your tools rapidly.Perfect for use with our sharpening strops.