Ideal for sequencing and sorting, as well as developing mathematical and motor skills. Each button has a number in relief and its equivalent Braille symbol. Each set includes 140 big buttons with 1 to 5 holes, (10) 3.28 ft. long laces, and individual activity worksheets in a jar.The Lacing Buttons, not only target mathematical and fine motor skills, but also offer assistance in the core curriculum for the visually impaired (who use tactile channels for learning). Visually impaired students can learn to count with these raised-line symbols and to read braille numbers.