Pair of Klipsch Synergy Black Label F-300 floorstanding speakers with 20cm (8inchi) double woofers. Tweeters are made of aluminum. Woofer material is unknown. Personally, I think the most expensive tweeter should be made of beryllium, the second of titanium, and the third and later of aluminum. If it is a horn like this speaker, you don't need a mesh net, but if it is a reverse dome tweeter that is recessed from the beginning, it is better to have a mesh net furthermore for double safety. The reproduction frequency is unknown. For example, it is not indicated from what Hz to what Hz the basic performance is. I prefer front bass reflex like this speaker because it tends to produce natural bass. However, for tweeters, I prefer beryllium or titanium.