A US-based startup has developed an eco-friendly shampoo ball 'Nohbo', which claims to be 100% waste-free. The shampoo balls and its packaging are entirely made from plant-based materials, making it biodegradable. The single-use Nohbo balls once exposed to water, starts dissolving into a lathery shampoo to use on hair. It costs $10 for a 15-ball pack of Nohbo.