Oil board is very durable and it's the highest quality material available for stencils. The advantage of oil board is that it doesn't allow inks or dyes to bleed through. The stencils have much sharper cuts because the oil lubricates our dyes. Each kit contains: a complete set of alpha and numeric characters; an extra A, E, O, R, S, N; assorted punctuation marks and various symbols such as "&" and "$".