Each icon is hand-coded along a 32x32 grid, and uses SVG stroke allowing for maximum style flexibility; meaning you can adjust the weight, color, size, and if you want the edges to be round or square. Either drop each icon inline directly in your page as-needed, or loaded them up via external .svg file and the use tag. You can then easily change the weight of the icon by changing stroke-width attribute. You can also change the shape of the line caps and the line joins with stroke-linecap...