Strong, lightweight, and highly durable. Sold in packs of 100. For the Erica 30 cm loom, we recommend purchasing an additional set of heddles. For the Erica 50 cm, we recommend purchasing 2 additional sets of heddles. For all other looms, we encourage adding 25 heddles/shaft for 8 harness looms and 50 heddles/shaft for 4 harness looms.