From their website:
One 90x120mm oval pressure cast resin base in the Trench Works theme with a beveled edge. This base features impact craters, duckboards, an unspent shell and crate with plenty of mud and puddles.
This base is perfect for your large flyer models.
This product is sold unpainted and should be washed in cool, soapy water prior to painting. Master sculpt by misterjustin