«It is made primarily out of wood? metal? plastic?»
Wood (often with some metal) was widely used in the past, Metal as the main material is the most common today, but plastc items can also be found.
BTW, this word has a lot of meanings, both as a noun and verb, so let's stick to the basic noun meaning from which all other ones originate.
EDIT: As for the size, _ _ _ _ _ s come is a great variety of sizes, and only rare samples can be held in the hand, but a lot of them can be held with one or two hands and even carried!