Slim old school style bobbins made from white or black PTFE for the classic look.
35mm x 8.50mm in size with 3 center windows slots for an internal isotope mounting. The weight of the bobbin itself is 5g and is a M5 thread, available as heads only and full kits. (no Isotope fitted)
 
Bobbins take a 3.0 x 22.5 Isotope or smaller