All Hario manual coffee grinders use burrs made of ceramic. The ceramic burrs do not transfer heat and shave the coffee bean versus cracking the bean like blade grinders.  This is the Plus, an upgraded version of the Skerton Hand Grinder.
This process provides a more consistent grind that can easily be adjusted and set for repeat use.

Colour: Transparent Black
Dimension: 17.2×9.3×23.1 cm
Capacity: 100g
Material
Glass bowl; Heatproof glass
Grip, Cap, Body: polypropylene
Handle grip,
Locking screw, Handle, Stopper, Grind adjustment nut: stainless steel
Hopper cover, Anti-slip cover: silicone rubber