From The Begg Website: This frame lock flipper features a .150 thick Bohler N690 hand ground blade available in three grinds (Fluted, Compound Swedge and Dagger) and 6AL4V Titanium scales that have been tumbled and given an option of two patterns (scallop or diamond). The Glimpse 5.5 is equipped with IKBS but also has the option of upgrading to ceramic ball bearings instead of the standard stainless steel. This will eliminate the possibility of corrosion of the bearings and increase the smoothness of the flipping action. The upgrade will also include a black ceramic ball in the pocket clip and a new “IKBS Ceramic” logo on the blade. The Glimpse 5.5 still features the Begg designed replaceable titanium lock bar with built in over bend and ceramic detent compression protection as well as a tumbled titanium back spacer and pocket clip.Clipped for tip up carry weighing in at 5.5 OZ. UPGRADES… CERAMIC BEARINGS.