Received the wooden Litko bases yesterday. This wood feels like I could snap it, but it also feels sturdier than balsa wood. The surface is also very smooth. The edges appear to be burnt.
They are 1.6mm thick (They also make a 3mm version). I bought 4 sizes and realized just a few minutes ago as I was measuring up the ships to them that one of the sizes, 60mm x 30mm, isn't for the ships. I got these if I decide to try painting up some 6mm samurai for Impetus.