These 4 Pin Velobind Machines are easy-editing, reclosable binding systems designed for use with 4 Pin Velobind strips. These machines produce documents that can lie flat like a book for easy stacking. Unlike Hot-knife Velobind machines, the use of 4 pin spines allows documents to be edited with ease. You will also find the 4 pin machines to be much more affordable than larger 11 pin systems. They give you the same looking final product without permanently securing your documents together.