Roastflask is made from environmentally friendly materials, making it a sustainable choice for coffee enthusiasts who care about the environment. Its durability and reliability make it an ideal choice for anyone who desires a smooth and rich cup of coffee without the hassle of traditional roasting processes.
The main roasting chamber is made of glasses and the outside skin will be made from ceramic or recycled coffee grounds. but it is not decided detail specifications yet.
But here are good example products which is made from coffee husk.
https://www.fastcompany.com/90604018/now-your-coffee-habit-can-help-build-houses
https://www.sciencedirect.com/science/article/pii/B9780124095175000310
