Fibre Optic Filaments 150 StrandsYou can touch, handle, wrap around the body, lie on them, strike, submerge into the water, etc, i. e. to learn their properties and quality visually and tactilely. Changing colours help to calm and concentrate attention. Extremely effective for children with visual impairments. The number of fibres in the bundle may be varied. It requires an interactive light source. Recommended Age: 3+ All fibres are 200cm in length