This is a used Brun Tilz tuba mouthpiece in silver plated brass with a Euro shank. The mouthpiece is in overall good condition but has some very minor scuffs on the rim (see photo).
The Tilz T4 mouthpiece is a wide rim, medium deep mouthpiece with a funnel shaped cup. The rim is thick and and cushioning but still has some bite to the inner edge. This mouthpiece would work well on lagrer BBb model tubas.