Great way to store your Isacord thread! The thread tray was specifically designed to securely hold your thread either at the base or the top of the spool. Each tray holds 18 spools, with two trays included, you now have storage for 36 spools in one compact unit. Trays come in the new Semi Super Satchel Storage box by Artbin (same depth as the double deep with half the width!). Dimensions -15.25in Length x 8in Width x 6.25in Height Thread not included.