ArtBin containers are perfect for storing and organizing supplies. Slim Line Box 4x 4 Open Core 2pc- The slim line box is molded from crystal clear, impact resistant polypropylene for easy viewing of contents. Its ideal for any project involving small supplies. The box is small and thin, making it easy to slip into a backpack or tote for transport. Product comes with two boxes. Measures 3.8x 4.2x .6.