Zannetti Piranha Mother-of-Pearl Blue steel with polished edges, carrure surface black PVD treatment; 51,30; 16 mm thickness; unidirectional turning bezel in finebrushed steel with a black aluminium ring, luminescent pointer and white minute track for the calculation of diving times. Screw-in case back with ‘Zannetti official Scuba Diving’ logo. Automatic helium valve at 9.