The Army Painter Battlefield Essentials and XP Serie. The Battlefields series has been made to give unlimited options to the wargamer, when he/she decides on what type of bases the miniatures should have.
All the materials are the best quality the market can offer the range has 2 series: the Essential series is the foundation of the base, with gravel, rocks, scatter and Static Grass. The Essentials are where you decide the theme of your army.
The specialised Battlefields is called XP, and these will add very realsitic and cool effects to any base. If you want to make an army a cut above the rest - look through the XP series for just that!
Game State is the authorised retailer for The Army Painter