Robotime ROKR Perpetual Calendar 3D Wooden Puzzle This is a vintage & unique DIY calendar 3D wooden puzzle. Build it with your hands, turn the wheel, and it could indicate the exact date from 2018 to 2040. Robotime-ROKR self-assembled mechanical gears wooden desk calendar LK201 is an easy craft for everyone. Precise laser cutting parts make it a fluent building 3D wooden puzzle kit. Ideal gift for any beginners new to building mechanical sets. EASY BUILDING CRAFT: One-star level of difficulty make it an ideal choice for any craft lover. DATE OF 2018-2040: Adjust the disk and set your time zone. This 3D wooden puzzle calendar can indicate the year, month, day, and week from 2018 to 2040. DECOR & GIFT: Elegant home decor for office or desk. Best gift for family or friends on birthday, holidays, or Christmas. Build pieces: 52 Approximate assembly time: 1 hour Glue & Wax not included - Suggested: Eco / Wood Glue, ordinary candles, crayons, beeswax What's in the Box: 1x 52 piece Mechanical Perpetual Calendar kit Product Dimensions: 17.5x9x17cm Box Dimensions: 37x23.5x3.9cm Recommended Age: 14+