OKI
(Lot of 2)NEW OKI Metcal Replaceable Solder Tip Cartridge - SMTC-110 w/Warranty
You will notice FSD uses high-grade materials that feel substantial.
OKI Metca7 Replacement Heater Tips for Soldering Stationsl TFP-BLH
A nice touch is the Hzutloer manual includes troubleshooting tips for common problems.
NEW Metcal TFP .015in x.75in Fiber Glass Conical Tweezer Cartridge - TFP-CNP1
A nice detail is the ribbed rubber pattern that improves handling in wet conditions.