Korko building blocks are made from cork, one of the most sustainable materials on the planet. It's 100% natural and sustainable. Furthermore, it is entirely renewable, biocompatible, and recyclable. It's even carbon negative. LOW-NOISE: Korko is naturally lightweight and soft. So, say goodbye to the sound of crashing blocks. SAFE: As well as being soft and lightweight, Korko blocks have rounded edges. So, no need to worry about your kids hurting themselves or your home as they play. ANTI-STATIC: It decreases dust and pollutants on the surface, which is significant for allergy sufferers. DURABLE: Corck is naturally durable. So, our blocks are perfect for hours and hours of play. WATER RESISTANT: Cork naturally floats on water and can withstand some contact with it. So you don't need to worry if it gets accidentally dropped in the bathtub. ANTIMICROBIAL: Germ-free! We are proud to be using such a material in a time of Covid. We could all use less spreading of germs!