Ceado E37SD Opal Burrs It is this purposeful passion which originates Opalglide™, the innovative manufacturing method specific to Single Dosing burrs. The SD Opalglide™ burrs ensure a more refined treatment of coffee beans, minimizing friction while improving the outgoing flow. Design dedicated to Single Dosing, innovative mechanical processing, ahead of the curve nanotechnologies. Single-dose coffee grinders E37SD and E5SD will feature as a standard the new Opalglide™ SD 83mm burrs (E37SD) and 64mm burrs (E5SD). Opalglide™ burrs are retrofittable for upgrade. These burrs are for the single dose grinders only