No teeth, no spring, lap joint.A precision tool that will keep on weaving for millions of rings.Made in Germany Max Recommended Wire Thickness (*See Notes Above): Stainless and Titanium (SS/TI): 18gCopper (CU): 14gBronze and Brass (BZ/BJR): 16gAluminum (anodized AA and bright AB): 14g Minimum Recommended Size (*See Notes Above): 22g