:Thanx. what is that white stuff used to finich it on the inside so if he digs he dont get splinters? Hi.. The white material in the enclosure is called melamine.It is very common in most hardware stores.It is simply particle board with a laminate on top.I use it every day.(I've been a professional cabinetmaker for 15 years)You can by it in sheets as well in different depths--it is very durable.