One skeleton on a 256 grid. Thicken it and you have the weights.
One sentence. IconKit picks the picture.
Drawn once, as centrelines.
Six weights, checked down to 16 px.
Thin, light, regular, bold, fill, duotone.
Takes weight, size and color.
Added to your library, matching its structure.
Change a line, rebuild, all six follow.
Within 2% of the originals.