Just your basic rubber bowling ball with a 3-piece pancake block. It was made during the latter stages of the rubber ball era (I believe late 70s to very early 80's), so it probably has a thinner shell than the the balls produced in the 50's & 60's. On today's conditions it's only good for use as a spare ball. Not even worth plugging and redrilling unless it's a sentimental or nostalgia issue.