From their announcement:
GameCraft Miniatures have launched a line of 28mm old west structures suitable for gaming in scales 25-30mm. The initial launch includes 12 buildings that are a mixture of 1/8" (3mm) MDF and 1/16" Basswood. Also including in this initial launch is a sign kit that includes 21 real wood signs that are laser engraved with real 3 dimensional raised lettering. The goal in producing this line of products was to create buildings that were more durable than the cardstock models currently available and significantly less expensive than resin models while maintaining a high level of detail.