The Wienerberger Terca Class B Perforated Blue is a Class B engineering brick, its highly durable and weatherproof. Suitable for walls, pavements and other masonry construction. Engineering bricks are specified for their physical characteristics and not their appearance. They have high compressive strength and low water absorption. Wienerberger was founded in 1819 and is now one of the world's largest producers of bricks. PLEASE NOTE: The image is for representative purposes only, if unsure please order a sample Due to the Covid-19 pandemic, brick manufacturers have seen a surge in demand which has led to stock shortages and extended lead times. The price set against the product is based on them being in stock and delivered out of selected depots. We will always try to make sure that our customers' orders are fulfilled, but in the event we cannot supply the bricks within our selected network we will offer an alternative solution where possible.