Enjoy the beer that you deserve.
Fine examples are made of actual animal horn, while others may be ceramic.
Typical volumes vary, depending on the size of the horn's former owner.
Use of a drinking horn today is a great way to get back to beer-drinking roots, whether you fancy yourself a Viking or a slayer of Grendel.
Drinking fermented beverages from animal horn was fairly common in Northern Europe in ancient and medieval times. There is mention of drinking horns in Beowulf and other Dark Age poems. In these times, the horn was dressed up for their new use with carvings and even precious metal fittings. Large examples found their way into ceremony like one in Dunvegan Castle in Scotland. So, you can hoist your horn in fine tradition.