For ease of decorating each sign comes in 2 parts, backing and frame, each piece is 6mm. Combined is 12mm. We recommend using letters with a height of 9cm or more.
We use traditional MDF and moisture resistant MDF depending on our wood stock levels. If you have a preference to which MDF you would like just let us know before placing your order. Moisture resistant MDF is stronger than common MDF, allows more efficient decorating and a smoother finish when decorated. This type of wood does have a green tint to it, we have added a comparison picture within the listing for your own reference.