These are chain operated Roman blinds, the kits were from John Lewis and the pale blue linen type fabric was added by us - they are lined (roman blinds need a backing material to work properly). Three roman rods per blind.
Sizes: 1265mm wide by 935mm drop and 1050mm wide by 935mm drop but if you were to replace the fabric, they could be extended by about another 100 - 150 mm as not all the cord comes out when we have them down. Seven mounting brackets ( 4 and 3) that need to be screwed up into the top of the window recess.
The blinds could be made narrower. Instructions from John Lewis are here: https://johnlewis.scene7.com/is/content/JohnLewis/sidewinder-roman-blind-in...
These are no longer available and are about 7 years old but still work, we have only removed them as we have replaced all our windows and are going for a new solution.