This item is perfect for your high-quality amp project. I use these vents for my own builds and they look awesome.4.25"X24" (approximately.) 309 Stainless Steel vent for custom build amplifiers. Will fit Marshall JMP/JTM/Plexi amplifiers. This is very durable material. Comes as 1 side polished.You can paint these vents if you use a sandblaster to rough them up, prime, and then paint. You can also heat them up to different temperatures to turn the stainless steel vent different colors. Just follow the guide below... Color Formed Approximately Temperature in Degree Celsius pale yellow 290 straw yellow 340 dark yellow 370 brown 390 purple brown 420 dark purple 450 blue 540 dark blue 600 This auction is for 1 vent, but I can sell you more and combine shipping.Buyer pays actual shipping. Please feel to ask questions and ask for a quote prior to bidding.Thanks!