The set contains 1 Back, 1 Left Side & 1 Right Side Vermiculite Firebricks suitable for a FX5 V3 stove.
Back Brick = 345mm x 190mm x 25mm
Left Side Brick = 217mm x 209mm x 25mm
Right Side Brick = 217mm x 209mm x 25mm 
The fire brick provides fire resistance, insulation and thermal stability and is rated for temperatures up to 1100°c.
All our vermiculite fire bricks are cut from Premium Quality Vermiculite Boards which are ideal for use in woodburning and multi-fuel stoves.
We advise when replacing your fire bricks that you replace the full set.