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HDPE Belt Stiffener Strips 0.040" x 1" x 48" (1mm x 25mm x 1200mm) black. These are not laser cut and have smooth edges all around.
Sold as a 5 pack. QTY 1 = 5 pieces. Berry compliant.
(https://cdn11.bigcommerce.com/s-v9bg0y5o/images/stencil/1280x1280/products/818/4442/HDPE_1200_WM__90782.1612975334.jpg)