These luxury backgammon counters are made from Galalith, which is a unique synthetic plastic material made by mixing of casein and formaldehyde. It's name is derived from the Greek words 'gala' (milk) and 'lithos' (stone), thus a form of milk is used in the process. This gives the finish a really luxurious semi opaque look with a really wonderful depth of colour. This particular set is Ivory and deep ultramarine blue. It's hard to fault these beautiful stones, expertly polished, balanced and sound wonderful in play. For serious backgammon players who appreciate the best quality playing stones.