About the mode:
For example: 13NSMM/T-50: 13mm-Glass tube outer diameter, N- nickel cup, S-multi stainless steel wire, M- mica, M- glass tube containing lead, T- with exhaust pipe, 50- glass tube lengh
13NSCM/T-50: 13mm-Glass tube outer diameter, N- nickel cup, S-multi stainless steel wire, C- porcelain ring, M- glass tube containing lead, T- with exhaust pipe, 50- glass tube lengh
