They are wood. I believe they are from a company called Amarr Garage doors.

Residential garage door manufacturer Clopay offers a similar garage door style in a durable, low-maintenance composite material that won't rot, warp or crack, and can be painted or stained. It's called the Canyon Ridge Collection. Numerous designs are offered in three species (Mahogany, Clear Cypress and Pecky Cypress) with or without windows. It is well insulated. See the options at http://www.clopaydoor.com/canyonridge. Professional dealers are located throughout the US and Canada. http://www.clopaydoor.com/where-to-buy