Exacompta Letter Tray (C4+ Size) Blue Angel certified because made of recycled fruit juice bottles. Robust and stable. Stackable either vertically or in steps. Oblique 15mm grasp. Label holder included. Thumbhole for easy handling. C4+ In size Robust and stable. Stackable either vertically or in steps. Blue Angel certified as they are made of recycled fruit juice bottles. Oblique grasp provides place for labels (not included).