no gap,no lap,waterproof,layers clear,can be bored 10hours,can be usd for 10 times Materials: Birch, poplarand hardwoodSize: 1220*2440mm, 1250*2500mmThicknes: 12mm, 15mm, 18mm, 21mmGlue: WBP, and melamineFilm: Black and brown(import and made-in-China)Quality: Little gap, little lap, unknit surface, CE standard. film faced plywood