Nordic Style Time Perpetual Table CalendarFeatureAssemble and insert the corresponding groove opening.Manually toggle the date, month and period through 3 small balls.The magnetic ball and the ring attract each other.Because of the cotton thread, the ball is at a certain fixed point of the fixed air ring, which refers to the month.The small ball that is attracted to the transverse rod points to the date.SpecificationProduct Name: Nordic Style Creative Time Perpetual Table Calendar Manual Desk CalendarioMaterial:  ABS plastic + MagnetWeight About: 600g /1 PieceColor: Black / WhiteSize: 23cm x 2.5cmPackage Includes:1 X Calendar NotePhoto Color Might Be A Little Different From The Actual Product.Due To Color Display Of Different Monitors.