KINGOU Wooden Brain Teaser Secret Opening Puzzle Box Magic Mysterious Box Gift Box Material: High quality beech External size: 5 x 1.42 x 1.42 inch; Inner size: 2.75 x 1 x 0.5 inch Recommended for ages 5 & up, children should be used under adult supervision, water-based paint, touch smooth You can hide a ring, a clue of gift or other surprises in it To make it challenging and fun, parcel without paper instructions, you can get the solution video by scanning the QR code, or contact us