The 3M off-white polypropylene cable stacker is sold 250 per case and is another quality product from 3M. The overall length and width are 3.35 in x 0.48 in.
From the Manufacturer
It 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 from 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.