Surdo Drums: Samba bass drum. The Samba band generally uses three sizes. The sizes we bring in range from 14 inch to 26 inch diameter. Heights are either 50, 55 or 60 cm. The shells are made from aluminium, and in wood. We list three main brands here, Gope, Contemporânea & Bauer; all are used extensively in Brasil and are ideal for processions.