4 Art Mechanical Pencils with 2B & 4B Lead Refill

I bought the lead for these pencils thinking I was getting 4b .5mm lead, and it was this weird square stuff, so I went and got these pencils to match the lead. i like the pencils a lot, they are like the mechanical version of a carpenter's pencil. The lead is fairly broad. Works great, it was just kind of pricey. These also came with some other colors of lead (blue, red and yellow) that don't work well and I don't need.