This little gizmo makes us so happy! At last, someone has invented a slider tube bead that works like a stopper clasp. Just string your cord or chain through (same direction or opposite) and the silicone center stops them in place. Made in Korea from 100% Brass. Naturally hypoallergenic, plating is nickel free and lead safe. (Meets California Proposition 65 Requirements). Works with 1.0 Round Leather. Angle-cut the leather ends to feed them through. Chain Nose Pliers may help.