Sitka Spruce - Sonically Graded Size:Classic We offer 3 grades with

We offer 3 grades with ranges of color variegation and figure

std and high stiffness

we offer only 51% of the wood that we test

The boards are then resawn into bookmatched sets and graded into one of three traditional grades

Ebony (Diospyros crassiflora)

Sitka Spruce - Sonically Graded Size:Classic We offer 3 grades withSonic grading is fundamentally different from traditional grading because the process relies on data and mathematical models to classify each board, this helps us to be much more accurate than what eyes only grading can do. By evaluating density, stiffness, Q (damping) and several other factors, the boards are classified into various groupings. Every sonically graded board is required to meet the following specifications: Density in the range of 350