These Rite in the Rain Pens will work on all Rite in the Rain paper as well as other brands of waterproof and normal paper. They will write in the wet, whilst upside down and even in extreme temperatures from -35° to +120°C (-30° to +250°F). They are also 100% leakproof and won't evaporate in warm climates.
This refill for the Rite in the Rain pens shown in the picture can be purchased.
Clicker Pen:
* Size: 14cm (5.5")
* Weight: 27g (0.06lb)
Bullet Pen:
* Size open: 13cm (5.25")
* Size closed: 9.5cm (3.75")
* Weight: 23g (0.05lb)
Refill:
* Size: 9cm (3.5")
* Weight: 9g (0.02lb)