Single labial pipe. It has six finger-holes(škulje, škuje) and often a thumb hole drilled in line with the first. The bore is closed at the top with a wooden block, with a narrow windway left for the air to strike on the edge of the labium on the upper side. Today, in the musical practice in Istria it is used to a much lesser extent than other instruments. Specimens found in the Istrian museums (Pazin, Labin, Porec) show that the production of the sopelica used to be widely distributed, especially in central and northern Istria.
A - the total length of the instrument
B - the length from the edge to the end of the instrument
C1 - the width of lower part of the sopelica
C2 - the width of the upper part of the sopelica
D1 - the average diameter of the sopelica
D2 - the wider diameter of the sopelica
E1-E4 - the distance from the labium to the first hole (E1); the distance between the other holes (E2-E6).
F - the inner diameter of the upper opening of the bore
G - the inner diameter of the lower opening mouth of the bore
H – the diameter of the holes for playing