Firebricks for pottery, available in various sizes, perfect for firing. The four of each size are new and unused, but have aged since being purchased with the kiln and have slightly yellowed. The four used bricks show signs of wear, but are in good working condition. - New - Sizes: 15cm, 9cm, 6cm - Quantity: 4 of each - Used - Size: 6cm - Quantity: 4 Thank you for viewing.