Additional heddles to fit the Toika Siru Rigid Heddle Loom are available in 3 sizes. If you want to weave on Siru using two heddles or to weave with yarns requiring a finer sett you can purchase an additional heddle in the size of your choice.
Unless you have requested otherwise Siru looms are supplied with a 30/10 heddle. This listing is for a 40/10 Heddle. This gives warp spacing of 40 ends per 10cm. This is equivalent to approximately 10 warp ends per inch.