ROKR Perpetual Calendar

Did you know that today is Uncommon Instrument Awareness Day? And we feature the most useful too in its uncommon form, our ROKR Perpetual Calendar DIY tool kit. 

With this exquisitely created tool, you can determine the day of the week for any given day between the years 2018 and 2040. Build, construct, and have fun with no fuss! Assembled size is 6.9 x 3.5 x 6.7 inches (L x W x H). With all the pieces that lock together, who needs adhesives?