Kenbi Stretch Device Yawara Bijin Kaikaku Better This is the "Yawara Bijin Kaikaku Better" stretch device, developed by Kenbi stretch trainer Chihana Amasaki based on her own experience. By sitting on it, you are naturally guided into a beautiful posture, and by swaying gently while using your own weight, you can stretch the muscles around your hip joints and perform leg-split stretches. Stretching the muscles around the pelvis and hip joints supports posture, helps create beautiful legs, and supports the lower back and knee joints. *Materials/Ingredients* ・Outer fabric: Polyester, polyurethane ・Filling: Polyurethane ・Core material: Polypropylene *Size* ・Approximately W32 x D45 x H35cm ＜Suitable size＞ ・Up to 100cm hip circumference There is some feeling of use, but there is no noticeable damage.