Assembled guards are 12.5 inches long end to end, and can be cut to any length down to 6 inches
Blades longer than 12 inches may require a wider gap between guard pieces or the option to create 3-piece guards by cutting a second pair. Smaller blades under 6 inches are unlikely to be compatible with these guards.
Springs make it easy to stretch the guards over your blades to put them on and take them off, and also hold the guards in place while you walk.