Beauty rollers are popular
There are various types (size and material) of beauty rollers to massage and stimulate your skin in Japan but my best recommendation is this one; Refa CARAT.
You can use the roller all over your body from face to toe, and even in the bath!
This one is larger compared to other products so it's big enough to work on your legs or arms.
It has a nice effect close to hand massage, with just about the right strength.
You can purchase them at electronic shops such as BIC CAMERA, for around 160 USD.