Plus-Plus is a whole new class of construction toy! One simple shape contains endless possibilities and hours of fun. Each piece easily connects to the next and lets your imagination create colorful flat mosaics or work in 3-D to make more intricate builds. Even curves are possible thanks to the unique design of this deceptively simple shape! A perfect STEM toy to develop fine motor skills, focus and patience - as well as design, imagination and creativity! Compatible with all Plus-Plus "mini" products. BPA-free and phthalate-free. Designed and made in Denmark.