The lightest wood used commercially, it's used to build model airplanes & some kinds of buoys
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... [DOC] [TLE] Balsa | The Wood Database - Lumber Identification (Hardwoods) [PAR] Balsa generally should not be used to hold nails, with glue being the ... Common 
Uses: Buoys, rafts, surfboards, model airplanes, musical ... it is generally the 
lightest and softest of all commercial woods, ranging from 8 to 14 pounds per 
cubic foot.