The stabilizing chemical used is resin based and this is where the variety of colours come from as different dyes can be added. The process gives each piece of wood a different finish and this, combined with the woods graining, means that no two stab wood mods will ever be exactly the same. This is one of the many attractions of stab wood, even if the mod is produced in large numbers each and every one will be distinctive and different.
Any variety of wood can be stabilized but the most commonly used are maple, oak, elm and burl (not a variety of tree but where a tree forms a growth and the grain develops in a deformed manner).