The Green 270 cap frame was designed to work best with the ball caps that have a flatter bill profile due to the way the bill fits through the clamp top of the 270. The Green 270 holds the bill more upright and ridgid than the later model GEN2, which makes it better suited for use on machines with slimmer/thinner sewing head profiles. Due to the ridged top clamp design the 270 has an exceptional grip on the front panels of caps. At this time the Green 270 will fit only on Tajima machines and machines with Tajima clone cap drivers.