UV Stable will not become brittle and break from sun exposure. Will not melt even if touched by a hot iron. High abrasion resistance. Suitable for fabric shades, tie backs, etc. Diameter: 3/8 inches Inside Diameter - 5/ 8 inches Outside Diameter Easy to sew on shades and draperies Clear Sew On Rings, 50 Pack. UV Stable will not become brittle and break from sun exposure. Sometimes referred to as the bone ring. Diameter: 3/8 inches Inside Diameter - 5/ 8 inches Outside Diameter