Shamrock was the fifth single released by the Japanese rock band, Uverworld.
The limited pressing of the single has a DVD containing the video digest of their live performance from their Timeless Tour @ Shibuya-AX.
It reached number six on the Oricon charts and sold approximately 97,091 copies.
[citation needed] It was used as the drama Dance Drill's theme song.
The full version of the ringtone has reached platinum status in February 2010 since its download started on August 2, 2006.