SYRLIG Curtain ring with clip and hook, black, 11/2" - IKEA
So Much To Make: "Hide-the-Clip" Ring Top Curtains
Rod Desyne Clips with Hooks in Black (Set of 24) 15-12 - The Home Depot
Amazon.com: Curtain Rings with Clips 1.5 Inch Set of 20 Heavy Duty Curtain Hooks for Drapes, Caps, Pictures - Rustproof & Decorative Black Curtain Rings for Bathroom, Living and Guest Room :