Swift Blocker Mini 75The most economical model, the Mini 75 produces the same size blocks as the 200 but in a smaller footprint for growers looking to use smaller sized trays or need less blocks. Total footprint of the blocks are 4. 5 by 14. Simple and hand operated, growers have the option of having a smooth or dimpled soil block through removable dibbles. The finished 75 soil blocks are approximately 0. 9 in size.