I never thought I could get so excited about a pencil until I started using these. The size and weight makes this a joy to write with. There are two colored pencils in the set that hold your preferred marker. Choose from a box of 5 lead refills or 5 red/5 yellow dense crayon marker refills. The refills fit into the pencil and are kept in place by a spring loaded, chrome plated collet. Simply press the knurled end cap to feed out more lead or crayon refill. The end cap also has a built-in lead sharpener! The pencils are 5 1/2" long and refills come five to a box and are 4 1/2" long. Great for large marking projects around the house and garage. We also sell the Silver Body, Lead Mechanical Pencil by itself so you can have one pencil for each color of refill.