The very popular ceramic keep cup that can be used with or without it's silicone lid.
They are wheel thrown with a beautiful grey light speckle clay.
Each cup measures approx 10.5 cm H x 8 cm W at the rim. 
They comfortably hold 250 mls.
Due to it's handmade nature there will be a variance of 0.5 cm - 1.0 cm to other keep cups.
The picture here is the actual item for sale.