Wood, very well made. Has a few marks on it from office use, but overall, very nice. File cabinet dimensions: 29 1/2 Height, 19 inch deep by 33 1/2 length. Drawer lock, with key, for hanging files.  Desk dimensions: Desk- 29 1/2 Height, 32 deep by 68 1/2 length. Extension desk:  29 1/2 height,  20 1/2 width by 48 length. This connect directly to desk (see photos).  4 drawers on desk/3 drawers on extension desk with pull out for keyboard. Also has corner shelf underneath for storage and a storage pocket. Desk is very study, very well made.  Priced to sale in DuBois, PA. Call me at (814) 375-0142, if not home, leave msg. will return call ASAP.  Thank you!  More pictures available upon request.  debra@zitomedia.net;debra.rhed@gmail.com  (my zitomedia email sometimes blocks emails, so send to both. )