The sound of the gbl mandolins and mandolas is characterized by maximum transparency and enormous volume.

Material selection and special creation of the soundboard bracing are factors that influence the sound of the instrument.

Different tones are also achieved by the choice of wood and the type of bracing (X-bracing or ladder bracing).

The soundboard is made of spruce that has been seasoned for a long time, the necks are preferably made of cedro or maple sources locally.

For the body the woods are maple, rosewood, walnut and cherry which of course also determine the timbre of the instrument.

Fingerboard and bridge are made of ebony or rosewood, the frets are made of wood chips.

The neck is reinforced by an adjustable steel rod accessible through the sound hole. Neck shape and width are individually adjustable.

Schaller mandolin tuners with mother-of-pearl buttons are the usually used mechanisms.

The scale is usually 370 mm, saddle and purfling are made of bone.

The strings are fastened underneath (bridge pins), or - if desired - run over an adjustable bridge and are fastened on a gold-plated tailpiece.