Lyra SPT (Stylus Performance Treatment) The Lyra SPT’s primary function is straightforward - by helping to keep your cartridge's stylus scrupulously clean, it assists tracking and minimizes damage to your records and cartridge. However, its benefits extend far beyond just stylus cleaning. Unlike any other stylus cleaner, Lyra has employed extensive listening tests during the development process of SPT, with the express purpose of improving the sound of your phono cartridge. Not only will it work well with all Lyra models, but you will likely find that it offers a significant sonic boost to other high-performance cartridge designs as well. Lyra has been very careful to design the SPT so it won't dissolve or damage any glue joints between stylus and cantilever. This cannot be said about all other stylus cleaners on the market, some of which causes damage (diamond styli fall out because of dissolved glue), especially if used excessively. manufacturer's website