Get ready for some numbers:
To determine the usable area of each of our three standard depths (24, 32, 40 cm, and for select products 50 or 60 cm), you have to deduct the thickness of the front and back panels.
Tylko Original Classic Plywood (formerly Type01 Plywood): front panel 16 mm, back panel 12 mm → subtract 28 mm from the depth.
Tylko Original Modern (formerly Type02): front and back panels 18 mm → subtract 36 mm.
Tylko Original Classic Veneer (formerly Type01 Veneer): front and back panels 19 mm → subtract 38 mm.
The usable height of a compartment is set as the row height shown in the configurator: 18, 28, and 38 cm. For additional rows at the bottom or top: 48, 58, 68, or 78 cm.
More details can be found here