Pina Zangaro Flexx 17"x11" Screwpost Portfolio Cover Matte ClearFlexx Screwpost Covers are made using light-weight acrylic with hinges made from ultra-strong HDPE. This combination of materials gives Flexx a thin profile with an edgy contemporary look. Available in two colors, Matte Clear and Cloudy White, in six standard formats, these books are compatible with all major brands of sheet protectors, mounting sheets and adhesive hinge strips. Nylon jackets (sold separately) are available for all formats to protect your portfolio from light, dust and scratches. Expand the portfolio’s capacity with standard screwpost extensions (sold separately). Lies flat when open.