Fully adjustable Crystal zip tie.  You choose the crystal color to add to a black tie.  

These ties are 20 inches in length from the knot to the end

Instructions

The zipper must be released before wearing this tie. To do so, grasp the knot in one hand and, with your other hand, give a slight tug to each side of the neck loop to free the zipper. Repeat if necessary. Do not pull hard, as this may break the zipper.

To wear the zipper tie, pull the loop wider (moving the zippered tail up) to fit the tie over the head. Adjust the band under the collar, then pull down on the tail to tighten the tie.

Rubbing the zipper with wax paper or candle wax will help keep the zipper tie working easily and smoothly.