Here's a metal pen that's ready for your most elegant proofs

with the cover illustration depicting the distribution of cone cells in the retina

Perfect for any future lab partner

orbits and planets – all drawn in crisp white lines on a royal purple background

With a crystal diagram in silver foil on an earth-toned cover

Mega Mystery Seconds Bundle! Entomology Here's a metal pen that'sFor a limited time, grab a mystery bundle discounted over 50%! Anything in the store is fair game: you may receive a bag(s), mug(s), glass(es), notebook(s), pen(s), who knows! Sometimes we come across items that aren't quite up to our standards. Rather than fill up the landfill with things that are pretty good but not perfect, we're making them available to our earth conscious customers who love deals! All sales final on Mutation Sale products.