Made of CIGS thin film solar cells, 90W solar panel are flexible and rollable. Unlike traditional solar panels of glass materials, CIGS solar panel are much thinner, lighter and safer. It works efficiently and can even perform well in diffuse light or low-lux condition. Another big difference between CIGS panels and others is that CIGS panels have no demand for stents in the process of installation, which is beneficial for reducing the cost of installation and later maintenance. Learn more detailed information, please click here: http://www.sygdcigscell.com/solar-modules/high-efficiency-and-waterproof-90w-flexible.html