La Rosa Percussion / Cajon The Blackie is a popular model with a matte black finish, parallel double string tuning system, and bass boost rings, making it suitable for a wide range of musicians, from beginners to professional musicians. ~La Rosa Percussion~ Based in Madrid, Spain, La Rosa Percussion was founded in 2012 following a cajon-making project that began in 2006. All models are made in Spain by skilled craftsmen in our own workshop in Madrid. These authentic cajons are characterized by their unique design and original sound, and are used by many famous artists around the world today. ~Product features~ ETS: Easy Tuning System. This system allows you to easily adjust the snare strings by turning the tuning pegs at the bottom of the cajon. 4XS: 4-string snare. BBR: Bass Boost Ring. This system boosts the bass. ~Specifications~ Body: 9mm birch plywood. Front: 3mm birch plywood/black elm veneer. Dimensions: 30x30x47cm.