Order this one if you do not know your ring size yet. The sizing kit itself is free. What you pay for is the ring voucher, worth one ChiroRing (SGD 259) with delivery included. How it works Order the kit. Minutes after your purchase, two personal voucher codes arrive in your inbox. Try the sizes. The kit ships first with sizes 7, 8, 9, 10 and 11. Wear the best fit for a day to be sure. Order your ring. Choose your finish and size, enter both codes at checkout, and the ring and its delivery are fully covered. What is inside 1 x ChiroRing sizing kit (sizes 7, 8, 9, 10, 11), yours to keep 1 x ChiroRing voucher, including all accessories Why size matters A well fitted ring reads your heart rate variability and nervous system load with precision. The right fit means reliable insight, every day. Also a lovely way to gift a ChiroRing to someone whose size you do not know.