Roundness

Roundness is an item value used to determine its capacity to block incoming attacks.
In general the higher an item's roundness and size is, the better it is at blocking attacks. If the item is a shield it gains an additional bonus.

long item::GetBlockModifier() const
{
  if(!IsShield(0))
    return GetSize() * GetRoundness() << 1;
  else
    return GetSize() * GetRoundness() << 2;
}