These boots became an iconic part of the Breaking Bad universe with the first appearance of "The Cousins" Marco and Leonel Salamanca in Season 3 of the series. Usually used to introduce the characters in a scene, the skull boot tips were shown multiple times throughout Breaking Bad and Better Call Saul.

The tips are made from sterling silver by Lee Brevard, just as the production/costumes on the shows were. The boots themselves are a cheap knockoff pair of what was originally used, and are stand-ins until I can find the correct brand and size.