[ Brand ] HTTMT® [ Safety Design] Cordless - safe for homes with children and pets [ Excellent Material ] The roller blinds Roller shade is 100% polyester fabric +reinforce thermal Insulated Coating. This material balances the temperature, maintains the indoor temperature during the summer, and keeps warm in winter. The waterproof material is good for bedrooms, kitchens, bathrooms, living rooms, etc. Durable and long-life time. [ Inside Mounting ] For the inside mount, the depth of the window should be at least 1.7”, and the blind width should be at least 1/2” narrower than the window width(wall to wall) [ Outside Mounting ] Outside mounting is easier in size selection, you just need to make sure the blackout fabric can cover the whole window.