The large pieces in this set interlock together with ease and can be used indoors or outdoors. Set includes 16 interlocking giant shapes in 4 bright colors and 4 shapes: 4 squares, 4 rectangles, 4 circles and 4 triangles. Each shape features Braille, which also creates a tactile experience. Ideal for younger children learning their first shapes; the chunky pieces are ideal for small hands. Can be used for pattern and shape sequencing activities.