This foam tray has 36 slots - each slot 50 mm x 25 mm x 40 mm deep. Ready to use - glued 10 mm foam base.
Dimension Feldherr Full-Size (FS) Foam Trays: 34,5 cm x 27,5 cm x 50 mm. The 50 mm depth of the foam is result from 10 mm foam base and foam tray with 40 mm effective thickness