A material's ability to resist indentation and its degree of difficulty in working with hand tool blades, strongly correlated with density.

Hardness has 5 groups: VS: Very soft; S: Soft; F: Firm; H: Hard; VH: Very hard.

See the guide: Wood density and hardness

Below are a list of values users can choose for this field group.

  • F - Firm
  • H - Hard
  • S - Soft
  • VH - Very hard
  • VS - Very soft