I. Introduction
Cowboy/4 Walls is the second Japanese release by F(x).
It features a double title track of 4 Walls and Cowboy, the group's first ever original Japanese song.
The album was released in three versions, a CD only version, a limited CD and DVD version, and a limited event only CD version. Both the CD and Limited CD + DVD versions came with one out of four photocards while the limited event version came with one out of four stickers. The limited event versions could only be purchased at fansigns, pop-up stores, or concerts, while the two other versions were available worldwide.
II. Tracklist
1. 4 Walls
2. Cowboy
3. 4 Walls (instrumental)
4. Cowboy (instrumental)
III. Album Tracks
