Find yourself using many dry erase markers, only to soon throw them away after drying out? Be green and save waste with our recyclable dry erase markers and color ink tank refills. Each starter pack box comes to you with 15 pieces: - 2 red bullet tip ink filled markers - 2 red ink refill cartridges - 2 blue bullet tip ink filled markers - 3 blue ink refill cartridges - 2 black bullet tip ink filled markers - 3 black ink refill cartridges - 1 mini whiteboard eraser the sealed internal ink cartridge allows these pens to arrive fresh with vibrant, high-quality, low-odor ink and are xylene and 2-butanone free. Throw-away markers contain a porous felt wick, which holds less ink and can easily dry out. Our pens must be primed before being ready to use, giving you maximum ink availability. Each cap has a solid connection to the body for air-tightness. Just give it a tug to remove and pop it back on when you are finished. Starting the flow of ink of each pen is easy. Depress the tip of the marker on a solid surface to break the seal of the internal cartridge and shake vigorously. Continue to shake and tap, the ink will take a few moments to soak into the pen tip. To replace a cartridge with a refill, simply unscrew the body of the pen, then remove and replace the cartridge. Quick tip: Have you ever accidentally used a permanent marker on a dry erase board? Never fear. Simply use a nonpermanent whiteboard marker and write over the accidental marking by getting it wet. The properties in the dry erase marker ink will wet the permanent marker ink and help whisk it away.