SECURE SLIDE STORAGE AND ORGANIZATION: RB-50 foam blocks help keep microscope slides and tissue cassettes upright in partially filled trays, cabinet drawers, or storage units. These square foam blocks prevent shifting and help maintain clean, organized laboratory storage systems. DURABLE REUSABLE FOAM BLOCKS: Each foam block is made from resilient polyurethane foam designed for repeated use. The firm yet flexible material holds items securely in place while maintaining its shape through daily laboratory storage and organization tasks. VERSATILE FOAM INSERTS FOR LAB AND CLASSROOM USE: These foam blocks work as reliable foam inserts for corrugated storage boxes, plastic filing trays, metal cabinets, and lab organizers. Ideal for laboratories, science programs, and classroom organization where small items need structured storage. BULK PACK FOR LABS AND CLASSROOM MUST HAVES: Each package includes 50 square foam block inserts (1.5" cube), providing a convenient supply for laboratories, research facilities, and classroom must haves where consistent organization and storage solutions are essential. Hold Slides and Tissue Cassettes upright in partially filled trays or cabinet drawers. Polyurethane foam retainer blocks are 1-1/2" cubed and are reusable. Great for holding up partial rows in corrugated storage units, plastic filing trays or metal filing cabinets. Packaged in convenient bags of 50 foam blocks.