I’m not sure how comfortable these pens are to write with, but they’ll make a very cool desk decoration for people who like retro space-age style. These 4 Color Ink Rocket Pens from Perpetual Kid are 5″ tall and 1.5″ in diameter – much chunkier than even those huge crayons you used in kindergarten. Inside are four ink refills in four different colors. Simply press the colored fin on the tail to select the desired ink color. They are available in the four designs seen here for $7.99 each.