Traditionally in Brittany and Normandy, cider is drunk from this shape cup, or 'Bol', the most traditional pattern is these. Also perfect for hot mulled cider.
There are sold in pairs, perfect to share a pitcher of cider 
They measure 10cm by 6cm, approximately 4" by 3", not counting the handles. 
There is a variety of designs, all similar and you will be sent a pair, but your cups may not match this picture exactly, this is just like a real Breton creperie!