Pencils will work great on Rite in the Rain All-Weather Paper but sometimes you need a pen. This All-Weather Plastic Clicker Pen writes on wet paper and upside down, the pressurized ink cartridge performs in temperatures from -30F to 250F. Pen holds steady in wet conditions with the rubberized grip. The ink won't leak, evaporate, or blow up in your pocket. 5 1/4" long, with a Barrel Diameter of 3/8". Black barrel,  grip channels near tip indicate ink color. Black ink. Refill cartridges available.