15 x 28 mm

Test item:
This is an Item created in Minifig scale and resized to fit on a 28mm head:

• the scale factore were 0.26-0.28 and oncemore in x dimension 0.9
• original head size: 10.2 mm
• scaled size
  • y: 2.65
  • x: 2.38
• the sizing should be measured on the eyline of your figure

Please beware 28mm scales have a broad range in figurine sizes (28mm-35mm) and even head size can vary to a normal human being between small and heroic, which can differ by factor 2

Variants:

• ​d3: American Fire Helmet
• d4: German Police 1920
• d6: Rosenbauer

please check these dimensions for buying.