In French, the preposition en is used to indicate the material something is made of.
Expressing material with en
Use en + material noun to say what something is made of. This structure is very common when talking about everyday objects.
- Une table en bois. (A wooden table)
- Une bouteille en verre. (A glass bottle)
- Un sac en plastique. (A plastic bag)
- Des bijoux en or. (Gold jewelry)
- Une chaise en métal. (A metal chair)
- Un pull en laine. (A wool sweater)