A mug with a capacity of 444ml (that's 15oz, if you're...well, y'know...before my time). This mug is so big, it's basically the same size as a single cylinder taken from a rizzed-up VW air-cooling 1776cc engine, and to be honest, it's a LOT cheaper.*
 
 
 
*I would not advise using four of these mugs in place of VW cylinder barrels. By all means, I will happily sell you four mugs, but can offer no guarantees regards their suitability to sustain compression in your engine.