ROKR Wooden Mechanical Gears - Perpetual Calendar

This intricately designed do-it-yourself Perpetual Calendar allows the calculation of the day of the week for a given date from the year 2018 to 2040. Surprise your family, friends, and colleagues with this mechanical Perpetual Calendar Desk Piece.

With laser-cut technology, the pre-cut wooden pieces are easy to pop out of the sheets. Made with safe and environmentally friendly wood from all-natural trees without any added toxins. The model comes packaged with clear, simple, and very detailed English illustrated instructions.

Ages: 14+
52 Pieces
Assembled size: 17.5 cm x 9 cm x 17 cm / 6.9 in x 3.5 in x 6.7 in
Difficulty Level 3 out of 5
Approximate Assembly time: 1 hour
No glue required.