1/2" Baltic Birch,9-plys in 5'x5' Sheets. BB/BB rating meaning B-grade face with a slightly lower quality Baltic Birch backing. Full sheets only. Availability: Usually ships in 2-3 business days. 1/2" Baltic Birch 5'x5' 1255BB$39.95 ©2008 Public Lumber Company. All rights reserved.