b'Ultra-Fit CircleMiniSmaller ring size facilitates better leg alignment and makes it easier to handle during exercise. 12" (30cm) diameter.3 Positions feet directly under hips for improved leg alignment3 Lower resistance works well for all fitness levels15083|$30 USUltra-Fit CircleLightweight, durable, flexible plastic in rubberized shell. Padded handles inside and out. Resistance approx. equal to 3-band Spring Circle. Outside diameter is 15" (38cm). Larger size enables user to put legs (or arms) inside circle for greater diversity of exercise options.14607|$35 USSee pilates.com for other Ring options.74'