Teak is one of the most valuable kinds of wood, but its use is limited by scarcity and high cost. Due to the heavy silicate content, it does not cause corrosion when placed next to metal; hence, it is extremely useful in ship building. No satisfactory substitute has ever been found for teak in this line of work. The A.B. Biller Teak speargun is as beautiful as it is functional. The barrel and butt piece are carefully cut from the same piece of wood so the grain matches precisely. The wood is hand-rubbed with boiled linseed oil.