YY Vertical's Vertical Board One is their flagship fingerboard. A training tool for those climbing between 5b-8b it grows with you as you get stronger. Use the 10mm magnetic inserts to make pockets smaller as you can get stronger or to train for a specific route. The depth of all holds is marked to make tracking your training easier. The large central handle makes training one-armed work easy. You can also use it to take some weight off with a resistance b&.