PME #0 Writing Tube. Seamless Stainless Steel.
Supatube 0 icing piping nozzle tube tip by PME
professional quality seamless stainless steel
size ZERO - fine line for fine writing & detailed work
please remember there is no standardised numbering system 
- different brands vary in size and US / UK systems are different
approx 40mm long x 15mm diameter at bag end
use the CEP adaptor coupling to change nozzles without having to empty your piping bag - laccording to PME, Supatubes fit a standard Delrin coupling but, in our experience, the fit can often be quite loose so we always recommend the CEP adaptor coupling which offers much greater stability and control
not just as good as Bekenal, but still a very good nozzle / tip / tube 
sometimes not retail packed