This is a Korean company that makes Swag brand bowling balls. I know nothing about bowling and was surprised by how varied the core of the balls were. Some illumination from the comments to the video:
This brings back a lot of memories as in the early 90’s I learned to drill bowling balls and had my own pro shop, eventually drilled for highly talented tournament bowlers. I drilled balls for almost 20 years. This particular ball that they are manufacturing is a high-end ball with a symmetrical or non-symmetrical weight block which allows the driller to position that block in a location That will handle different oil conditions for the bowler plus allowing them to hook or not hook the ball more or less. If you notice on the label of the box each ball at the end of the process is weighed in a way that tells the driller where the center of gravity is, where and how the weight block sits, how much top weight is Positioned in various places on the ball and allows for more flexibility in the drilling process. The simple “ house balls“ that bowling alleys carry for every day bowlers to use off the rack have a pancake weight block or no weight block at all and the process is 90% straightforward and easier as it’s just a simple solid pour and a clean up label and shine. Nice video as it brings back many memories of my pro shop in Alaska. - rickalford