Nagaoka Shoten Relieve muscle stiffness in 30 seconds! Head Refreshing Beauty Shell Brush

The Beauty Shell Brush (product name) was supervised by Mari Funatsu, the world's number one esthetician.
Using smartphones and PCs can cause tension in the muscles of the head and impair blood circulation.
The protrusions on the brush have three different levels of hardness, divided from the outside in as "extra hard," "hard," and "soft."
The Funatsu method uses three layers of protrusions to grip and loosen muscles, improving blood circulation.
Since it can loosen muscles in just 30 seconds, you can do it anywhere—at work, at home, or whenever you have a spare moment.
(One brush, 12-page introductory booklet)