The Roland Music Lab Expansion kit allows your group teaching system to grow. Piano Solutions can install and assist you with all your group piano teaching needs. Professional installation and classroom design are included! Please call us for more information about creating the perfect environment for classroom piano education! Lab items are special orders and may require installation and classroom layout assistance. Please contact us PROIR to ordering so that we may recommend the proper items that make your classroom keyboard lab successful. Contact us at: Sales@pianosolutions.net