Securely holds thread spools regardless of how the closed box is stored. Spool trays offer the capacity to hold (224) 20mm spools, (108) 32mm spools, or (30) 45mm spools. Designed to easily stack and work together. Molded in translucent Acid Free polypropylene. This package contains one 14x15 inch satchel box with removable trays (accessories not included).