This is a one-off leather in which a horsebutt hide (with shell intact) was processed with Horween's new Aspen tannage, which involves a tumbling step that gives typical Aspen horsehide its light pebbled effect. This tumbling step caused the shell within the horsebutt to noticeably wrinkle. At this time, I believe this one-off leather was unintentional or experimental. Leather color is black with machined black thread.