Our 100% premium Russian birch panel is made to our specifications and trimmed, printed and tested in our factory. We select the wood quality and the glue and tell the supplier how to make it. Rugged solid core construction prevents indentations caused by high heels, chair legs and appliances. All edges are trimmed perfectly square for a “tile-tite” fit. Every square inch undergoes ultrasonic testing for core voids and internal delamination which might cause bubbles in the finished vinyl floor. Face panels have knots removed and replaced with solid wood plugs, no chemical patches and used. Will not stain vinyl floors. We do not ship potential problems just because you cannot see them.