This is a neck and shoulder massage tool I bought a few years ago. It feels like you're lying on a moderately soft rubber surface with protrusions. Here's the product website description: Are you tired from long hours of desk work? A savior has arrived for you! Just place it on the floor and lie down to experience "acupressure" and "stretching"! It's like having a chiropractor at home. It relieves shoulder and neck fatigue caused by long hours of desk work and brings comfort to your daily life. Highly praised by a popular chiropractor who has cared for about 20,000 people! Relieves stiff shoulders. By simply lying on the pillow for about 5 minutes a day, it stimulates 14 pressure points from the shoulder blades to the back muscle line, and the special shape that arches the back muscles further loosens the stiffness of the muscles around the shoulder blades, allowing you to stretch (loosen, relax, and extend) while lying down. This is an acupressure device designed for home use and can be used by one person. The firm protrusions are designed to knead inward, and attention has been paid to the placement, size, height, and angle of the protrusions. The scissor-like split tips open, making it easy to fit various body types. The gentle curve creates a slight flex, allowing people of all ages, from the elderly to the young, to use it comfortably.