Swift Blocker 200 (Commercial)The Swift Blocker produces 200 soil blocks that fit perfectly inside of a standard 1020 tray. The finished soil blocks are approximately 0. 9 in size and weigh approximately 10 grams each using a standard soil mix. The bottom and top pieces of the Swift Blocker weigh about 13 pounds combined. Please note that these are the previous style and are listed at a discounted price to make room for new inventory of the most recent style featuring permanent