From triangle to polygon: the children can sort and stack forms and colours and build with the discs. While stacking, the eye-hand coordination is stimulated and fine motor skills are trained. Eight discs for stacking. Materials: lime wood, non-toxic water based color stain. Size: height 17cm, diameter 18cm, disc thickness 2cm. WARNING: Potential hazardous accessible points. Always put on safety cap while not assembling or disassembling wooden coloured discs.