At the top and the bottom of our custom blinds there stretches a pine slat, one at each side, where we fix the mechanics needed to move the blinds on. The slat at the bottom is semicircular in both cases. At the top, in case of visible mechanics (1G), we put a grooved slat, and in all other cases (2G, 2R and 3G mechanics) we put solid, square shaped slats. If you would like, you can make your own blinds with selecting the neccessary parts.