Rainbow Knit Blockers from Knitpro are an effective and colourful way to block your finished projects. The knit blockers set contains 20 blockers in a handy plastic storage box. The blockers come in 2 sizes: 12 with 8 pins (approx 7cm wide) and 8 with 4 pins (approx 3.5cm wide). Each blocker also has anchor holes for attaching string/blocking wires to ensure straight edges

Not sure how to use them? Read this blog post from KnitPro for the benefits of blocking and how to use the blockers.