This is a limited edition thread. Silk check is made the same way silk purls are made but instead of using a round 'needle', the 'needle' is triangle shaped and rotates while the check is formed. This rotation of the triangle 'needle' leaves a bend in the coil that rotates around the thread, creating a fantastic texture. Silk Check can be used in all the same ways that silk purl can be used to add a nice contrast to the smooth silk purl. There is a extra photo that shows the sizes of the silk purls compared to the silk check as well as looking at the end to contrast the round vs triangle shape. Boxed in 18" lengths.