Blackriver Fingerboard Ramps - Extension QuarterIt doesn't matter if you're building a park, your own desk spot or are in need of a sick transition obstacle. The Blackriver Fingerboard Ramps Extension Quarter is a necessity for all of these occasions. Blackriver's interpretation of this skate park classic offers everything you'd want of a transition obstacle. A chill radius, perfectly fitted coping, a small extension on one and smooth veneer ready for your next session.