Byers Choice Twelve Days of Christmas-Carolers Puzzle Byers Choice Twelve Days of Christmas-Carolers Puzzle is thoughtfully designed with over 500 interlocking pieces which will surely blow your boredom away. Made of high quality thick cardboard which makes the Puzzle durable and last longer. Kids of all ages will love this beautifully made wood advent calendar box! Measures 21.25" x 15" when assembled. Handmade in the USA. .