Bolo Ties and end caps are all sterling silver with natural stones (unless otherwise noted). The cords are real leather in either 3mm or 4mm thickness. Non-leather cords are an option, on custom orders only. Two sturdy rings act as the sliding mechanism on the back of the bolo pendant. Please grip the pendant on the sides and the cords toward the bottom to slide it up and down. The rings on the back can be slightly adjusted for a desired tension, but really not necessary. Repeated adjustments are NOT suggested and not my responsibility to fix if overused improperly.