A Professional Series end-grain maple board from JK Adams (SKU PRO-1616-M). Official specs are 16" x 16" x 2". Official page lists 13 lbs. Maple finished in their mineral oil and beeswax, North American hardwood, made in the USA, lifetime guarantee. End grain is listed as easier on a knife edge and less likely to show knife marks. Specs from JK Adams' professional end-grain maple 16x16 page.
Handwash with warm soapy water and dry it. Do not soak, dishwasher, or microwave. Oil and/or beeswax when the wood feels dry.
Square maple end-grain. 13 pounds.