3M SI-1 Stak It Cable Stacker organizes cable runs and aids in identification putting an end to tangled wires and the potential heating that could occur when cables are held together tightly under a single fastener. The 3M Cable Stacker SI-1 is made of reclaimed plastic. Installation is easy with cables snapping in for a positive lock simplifying compliance with the spacing requirements of the National Electrical Code article 300-4-(d) and the Canadian Electric Code Part I Section 12-516. Made in the U.S.