The Fp1000 series uses a 10mm lower tube and 7/16 upper tube. Kits provide everything incuding a Heritance steel nib. Options available are the front sections for Meister Nib and Bock #5 feed assemblys.
1-upper tube 7/16
1 lower tube 10mm
1-#5 Heritance nib feed assembly inc. steel Heritance nib
1- Schmidt converter
Sterling Silver caps/finials, Center band, nib assembly and a clip