Grade "BB"	-
	Single piece face has light and uniform colour. A few sound tight knots and pin holes are permitted. Open knots and defects are replaced with small oval or round veneer patches before gluing. The patches are selected to closely match the background colour.
Grade "CP"
	Single piece face is very close to Grade BB in quality. Thin splits are allowed. The oval or round patch may have a different colour from the background.

We use BB ply to make our pull out shelves. Most pull out shelves found on the internet are made from CP ply, making our product a grade above.

Notice thin splits are allowed on CP panels. Even though they will not be very evident when first received, as expansion and contraction occur over time, these thin splits can become larger and separate the ply's