Choice of sound and design 

Each Spiri trumpet is custom-made and unique. The player chooses sound and design specifications from a range of materials, elements, and finishes. Gold plating gives the trumpet a fuller and mellower sound than a lacquered one would. Each combination of wall thickness and bore affects the stability of the sound differently. For a unique design choice, the finger buttons can be inlaid with mother-of-pearl or semi-precious gems of various colours.

The finishes available either for the entire instrument or its individual parts are: clear lacquer, gold lacquer, anthracite lacquer, copper, silver, gold brilliant, or matt.