Interior of the bell and microbrushed piston block, brushed exterior. Completely uncoated, the protection of the instrument is done by depositing a film of a special dry wax that is resistant to moisture and friction.
Inside of the block and the pistons are cleaned and de-oxidized. The alignment of pistons corrected by 3D printed felts with an ultra-flexible filament. A gant of longevity and stability!
All the slides are free and waterproof. Compression is at the rendezvous.
