Lung capacity is a significant indicator of physical fitness. The lung volume kit gives students the opportunity to understand their own physiology more thoroughly. Kit includes: a durable plastic bag calibrated to 6 liters, mouthpiece and mouthpiece holder. Shipped directly from the manufacturer.Kids like learning when they can play with a ball to learn! These colorful 24-inch inflatable educational balls are an excellent way for children to build skills. rush shipping not available. Gift wrap not available. Information on how to place your order by fax or by telephone. Grades 3-9. Product Number: AM6050 (Lung Volume Kit Set of 4), AM6033 (Mouthpiece Holders only Set of 4), AM6034 (Lung Volume Bags only Set of 4), AM6035 (Mouthpieces only Set of 8)