Celestion SL600Si Aerolam Bookshelf Copper Tweeter Speakers. These have installed a pair of woofers from my SL600 set due to one being damaged, its the same woofer, however I did replace both so they would match. One copper tweeter has a small dent approximately 1.5mm x 3mm doesnt seem to affect the performance and both tweeters sound great. The cabinets are not dented or damaged and the finish is in fairly good condition with a few light marks the camera wont pick up. These require a bi-wire set up to run properly. Two for the hifi leg of the crossover and two for the bass/mid range. The way I set mine up was to run the normal speaker wire to the red and black middle jacks and then I ran separate wire from the amp for the red and black outside jacks. These require banana jack ends. You wont be disappointed!! From a smoke and pet free environment. Shipped Fedex or USPS Ground. Specs from the internet:Celestion SL600: two-way, sealed-box loudspeaker with Aerolam (aluminum-honeycomb) enclosure. Drive-units: 1.25 copper-dome tweeter, 6.5 Kobex-cone (PVC) woofer. Crossover frequency: 2.3kHz, second-order, 12dB/octave slopes. Frequency response: 60Hz-20kHz ±3dB, low-end, -6dB at 60Hz in free-space conditions. Sensitivity: 82dB/W/m. Nominal impedance: 8 ohms. Amplifier requirements: up to 120W on program.Dimensions: 14.5 (368mm) H by 7.75 (197mm) W by 9.25 (235mm) D. Enclosure volume: 12 litres (0.4 cubic feet).Weight: 11.25 lbs (5.1kg) each.