This silver color Round Bolo Slide will fit almost any cord size from 3mm to 5mm. Made of base metal and silver plated with a 1/2" (13mm) plastic disc these easy to use Bolo Slides can be glued onto any flat surface to create a unique design. Glue on your favorite bauble, coin or gemstone with glue or epoxy. Our favorite glue is E6000. A bolo tie (sometimes bola tie or shoestring necktie) is a type of necktie consisting of a piece of cord or braided leather with decorative metal tips – secured with al clasp or slide.