Softskins are not hollow. They are one of the oldest lines of products that we carry. They are made of a soft outer skin of PVC, with a soft and cushy filling made of foam fiber. These are designed as non-vibrating dongs, and they are very soft and pliable. The model you are inquiring about is the largest in the group with a length of 8" and a 2" diameter. There are models at 5.25"x 1.5", 7"x 2", and 7.5"x 1.75".