A set of modular hill pieces, and a plain tile that can be used to raise pieces or to create a table.
The pieces are connected by openlock clips. Please google search for openlock to get the clips.
The theory for this is that a table or hill is composed of blocks that are 15cm x 15cm x 1.5 cm high. The plain tiles can be clipped together to make a table of any size. The hill pieces can be clipped together to make basic conical hills, ridges, half hills. There are two varieties of hills - 30mm high and 45mm high. Also note that the hill pieces do not always fit into a 15x15 square - there are some minor overlaps to give hills an irregular appearance