Our designs are optimized to fold correctly based on the style and custom dimensions you select for your box project. Our system is set up to automatically select the flute size that will function best for your box size and style. Currently our automated system will either select "E Flute" (1.5 mm or approximately 0.059 inches) or "B Flute" (3 mm or approximately 0.12 inches) based on your box style and dimensions.
For this reason, we do not offer the option to select your own flute size for your corrugated material.
To see what E flute and B flute look like compared to other sizes, please read our article "3 Common Types of Custom Packaging Materials".