This is a twin ball that makes tennis ball massage easy. The narrow space between the balls makes it ideal for myofascial release around the spine for those who are small or slender. I used to have the La-VIE Kataomo. That one had a wider gap between the balls, and it didn't hit the areas I wanted to loosen on either side of my spine, so I looked for this one and bought it. For those with similar concerns. I haven't used it much lately, so I'm letting it go while it's still in good condition. There are no noticeable stains, but there are small black dots that were originally on the product as a manufacturing defect. They are barely noticeable unless you look closely. Size: Approximately 5.5cm (length) x 11.5cm (width) Color: Mint Green It will be shipped via Yu-packet Plus. Thank you for your understanding of this used item that has been stored by an individual. [Features] ● You can self-massage just by rolling it. ● You can pinpoint and stimulate the fascia and muscles in deep areas that are difficult to reach, and refresh yourself. ● Can be used on the whole body, from the neck to the soles of the feet. ● Stretches stiff fascia and stimulates muscles. ● You can massage your back and lower back while sitting, and it can also be used on your buttocks, hands, and feet. [Uses] ● For whole-body massage from the neck to the soles of the feet. ● For those who have to maintain an unnatural posture due to work or housework. ● For stiff shoulders, lower back pain, and headaches Massage Ball Twin, Refresh Twin Ball, Relax Twin Ball, Twin