From KnitPro.
Made from high-quality stainless steel, with a hypoallergenic coating.

Available in six sizes, in both Black and Rainbow colourways.

7: inner diameter = 17.3mm

8: inner diameter = 18.2mm

9: inner diameter = 19.0mm

10: inner diameter = 19.8mm

11: inner diameter = 20.6mm

12: inner diameter = 21.4mm