This gold color Round Bolo Slide will fit almost any cord size from 3mm to 5mm. Made of base metal and gold plated, 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.