In an effort to promote the new creative team shuffle that will be taking place with June 2013's Green Lantern titles, DC Comics is once again unleashing the free Green Lantern themed rings that make up all the colors of the Emotional Spectrum! However, instead of being glossy this time around, the rings will have matte finish to them.
Starting with Green Lantern #21, the Green Lantern Ring will be bundled with the issue, followed by the other colors packed with the successive GL related titles until all 9 are complete. For more information, visit the source post at Bleeding Cool!
UPDATE: Giving the list of the rings and the issues as they will be released accordingly:
Green Lantern #21 - Green Ring
Green Lantern Corps #21 - Blue Ring
Green Lantern Corps #22 - White Ring
Green Lantern: New Guardians # 21 - Indigo Ring
Green Lantern: New Guardians #22 - Yellow Ring
Larfleeze #1 - Orange Ring
Larfleeze #2 - Black Ring
Red Lantern #21 - Red Ring
Red Lantern #22 - Violet/ Star Sapphire Ring