16x16x2 and 1/3 Ramp Raised Platform Baseplate, LEGO® Part #2642. These are used in decent condition so they may have some marks and/or scratches. 

Released in:

Light Gray - Hurricane Harbor (6338), Inter-coastal Seaport (6541), Launch and Load Seaport (6542), Metro Station (4554), Pier Police (6540), Plateau, Approach for Harbor (5044), Sail N’ Fly Marina (6543), and Train Station (2150).

Dark Gray - Emergency Response Center (6479), Railway Express (4560), Railway Express with Transformer and Speed Regulator (4561), Grand Central Station (4513), Train Station (4556). 

If you are looking for any baseplates that you do not see on our website, call the store at 470-414-2208 and see what we have in stock!