In general you do not need any special posts for use with ADVANCER® shelves. Round or square cordierite posts with a hole down the center will work just fine. Hard fire brick soaps (2-1/4” x 2-1/2”x 9”L) in various lengths may also be used. It is not advisable to use full hard bricks (2-1/2” x 4-1/2”x 9”L) as posts with ADVANCER due to potential uneven thermal gradient problems created by such massive shelf/post contact areas. Wadding between shelves and posts is frequently used to promote setting stability, and is an acceptable practice with ADVANCER shelves. It is also recommended to use a suitable kiln wash on the ends of posts to prevent sticking between ADVANCER shelves and posts after repeated firings with posts in the same spot on the shelf surface.