These rustic brass rings were individually cast by an African artisan. Brass casting is a traditional craft of Ghana in West Africa and has been practiced for generations. Each brass ring has a ridged pattern along it's circumference. Individual rings measure about 4mm wide and 14mm in diameter. The generous 6mm hole is great for thicker cord, leather, or other stringing material. Get 10 rings with each set. Current stock may be smoother and less textured than those in photo.