The addi Click Interchangeable Short Tip Lace system provides 8 different sizes of addi Short Tip Lace tips (3.50 mm, 3.75 mm, 4.00 mm, 4.50 mm, 5.00 mm, 5.50 mm, 6.00 mm, and 8.00 mm), five different lengths of our new, extremely pliable blue cord (16", 20", 24â€?, 32â€?, and 40â€?), and one connector piece which helps to either store stitches or combine your cords. The Click tips require no tools to change; simply insert the cord deep into the tip, twist and release. The tips will remain secure until you change them, thanks to the Clicks' revolutionary locking mechanism! These tips are approximately 3.5" long.