John Boos
Plastic-free by nature of the craft rather than by campaign: these are solid maple and walnut boards with only food-safe glue between staves, a category that never needed plastic in the first place. John Boos doesn't market "plastic-free" because the product is simply bare wood. Zero plastic in the food-contact surface.
How clear are their specs?
Not much to disclose - it's NSF-certified hard maple or walnut with food-safe glue, visibly so, with no coatings or finishes hiding the material.