Lay out your designs before you string them! Try out as many bead combinations as you like and find your ideal creation without cutting a thread. Enable your creativity and prevent having to redo your necklaces over and over because you decide you don't like the results after you finish! The channels are marked in both inches and centimeters. Very portable. Comes with fitted lid so you can pop it on and go! Dimensions: 7 3/4 inches wide, 11 1/4 inches long, just over 1/2 inch high.