The dullahan is a headless rider on a black carriage pulled by six black headless horses. Normally he made no sound as he passed, which is how you could tell he was from an 'otherworld'. In some areas of Ireland the dullahan is seen riding solo on a large black steed without the carriage and headless horses.
Dullahans themselves are headless and carry their severed head with them, either tucked underneath their arm or raised high in their right hand. The head is the color and texture of stale, dried out dough or moldy cheese. It sports a hideous grin and has small black eyes that dart back and forth. The whole head glows like the phosphorous in decaying matter and the horseman uses his 'lantern' to find his way along the darkened roads of the Irish countryside.