Izzo Senior surdoIntroducing the Izzo Senior surdo The surdo is the biggest, deepest drum and plays the heartbeat of samba music. A combination of the deep aluminium shell and durable white Nylon skins the definitive samba drum construction materials ensures optimum resonance which creates that recognisable carnival tone. Each drum comes fully assembled and includes a tuning key for tightening the skins, and the durable nylon head makes this drum great for classroom