Mouthguards for teeth grinding English only, no Japanese instruction manual (16 pieces in total, 4 used) Unopened: 12 pieces Disposable mouthguards for use day or night Tasteless and odorless Durable construction Individually wrapped, disposable for hygiene Due to shipping thickness, the mouthguards will be removed from the box and shipped in their individual packaging. The box will be flattened for shipping.