Material: Often made from "unbreakable" polycarbonate or hard acrylic plastic.Colors: Available in transparent "smoky" brown (as pictured), smoke gray, or clear.Design: Features a stackable 2-tier structure held together by sturdy risers.Dimensions: Approximately 355 mm x 255 mm x 45 mm per tray.Top Organizer: Some versions (like the 1758/UT) include an additional utility top with dedicated spaces for pins, clips, pens, a tape dispenser, and Post-it notes.