Dr Slick bobbins have either titanium inserts, ceramic inserts or Glass Inserts for ease of use and durability.
Titanium Oxide Inserts – A new Material more lubricious than Ceramic.
Ceramic Inserts – The Gold Standard – The smooth Crystalline Substance is extremely Smooth.
Glass Inserts – A Hyper-smooth small diameter insert designed for threads 8/0 and above as well as Synthetic Threads. Ultra Slick.