Designed with an entire row of sharp, sturdy, and rust-resistant steel pins embedded into two different sizes of tough plastic handles in sweet rainbow colors, they're much easier to use (and less stabby) than individual T-pins, making the creation of straight, evenly tensioned edges so much faster! Anchor holes in each blocker allows the user to attach string along large sections which can be pulled and pinned to maintain consistent tension for super high-tension blocking of items like lacework. We recommend getting two sets for larger projects like shawls and sweaters.