Nine Circles is a UK supplier of Japanese budo equipment, serving practitioners of martial arts including kendo, iaido, aikido, jodo, naginata, koryu, karate and ninpo. Its extensive online range includes training clothing, uniforms, hakama, belts, footwear and protective armour, alongside shinai, bokken, jo and other wooden weapons. For iaido and related disciplines, the store offers iaito swords, sword-care products, parts, bags and test-cutting accessories.

Customers can also find books, DVDs, gifts, tenugui and equipment bags, as well as beginner packs, special offers and outlet items. Product options include both standard and specialised equipment, with selected iaito and other items available in specific ranges or custom-built versions. Nine Circles provides practical shopping support through sizing guides, a help centre, delivery and returns information, and resources on topics such as iaito maintenance and bogu sizing. Gift vouchers and a dojo discount scheme are also available. The company operates online from Gloucester and states that it has no public shop or showroom; visits are by appointment.