The New "IM-POP" Cassette has been developed as a result of our experience in making and using reels with the Cassette System for five years. This is the new way to enjoy our revolutionary and patented system: Handy, Light, Simple, Easy and Inexpensive. It is a system that enables you to just pull to change the cassette (less then five seconds are required), to change it from left to right hand retrieve; just flip the cassette over.It is manufactured with our latest injection molding technology made of a special aluminum alloy, light and very strong, it is "Salt Corrosion Resistant" and has the smoothest disc drag available in the market, proven in thousands of STH Reels in the field for many years. Patent No. 5.120.003