This is a massage ball from Trigger Point, a well-known brand for fascia release products. It has two balls connected, and the length of the axis between the balls can be adjusted in two stages (165mm and 127mm). Size: Ball diameter: approx. 6.5cm Weight: approx. 93g Material: EVA ↓↓↓ Excerpts from the website below ↓↓↓ ◯ Loosens fascia and increases flexibility in the cervical and lumbar spine areas ◯ Relieves stiffness in the neck and back, increasing flexibility ◯ Promotes blood and oxygen flow, keeping fascia and muscles healthy ◯ Unlike tennis balls, it uses durable and deformation-resistant EVA foam material ◯ Surface stripe structure to prevent slipping during use ◯ Releases deep fascia and muscles that are difficult to reach with pinpoint pressure ◯ Increases the flexibility of hardened fascia ↑↑↑ End of excerpt ↑↑↑ I bought this thinking I would use it while traveling, but I never used it. I use a foam roller at home and don't use the ball, so I'm putting it up for sale. I hope someone can use it. The condition is not bad, but please be aware that this is a used item stored at home. It will be shipped in simple packaging because it is just the right size to fit in a Yu-Packet Plus envelope. Please understand. Instant purchase is OK(^^) Feel free to ask if you have any questions!