ROKR is a mechanical gear kit made from laser cut wood. This beautifully designed Perpetual Calendar allows the calculation of the day of the week for a given date from the year 2018 to 2040. The item has been designed to target wide range of audience – ranging from hobbyists and puzzle builders to teens and adults who just loves making things! It can also become a great bonding project with smaller kids as a helper to find the right parts and teach them with how gears work. There are no scissors or any other tool required for assembly as all the parts fit together and lock themselves in without any glue. ROKR Perpetual Calendar is a perfect gift to bring and steal the attention on birthdays and as stocking stuffers to delight everyone with a kid inside their heart!