Alright arcade builders, these EG Starts 4-inch buttons are absolutely massive and perfect for custom arcade projects! The 100mm diameter (that's about 4 inches for us Americans) makes them super satisfying to press - they've got that classic arcade feel but on a larger scale. The blue LED lighting looks fantastic when powered up - really gives that authentic arcade machine vibe. They work on DC 12V power, which is pretty standard for most arcade setups. The micro switch inside is rated for 1 million presses - so these babies are built to last through countless gaming sessions. Installation is straightforward - you'll need either an 88mm or 24mm mounting hole depending on your setup. The PVC transparent material gives that nice glow effect when lit up, while the ABS construction feels durable and solid. They come with the bracket and LED included, which is convenient. I used these in my Raspberry Pi arcade cabinet build and they work perfectly - responsive, great tactile feedback, and the lighting is evenly distributed across the entire dome. The convex shape feels natural under your fingers during intense gaming. If you're building a custom arcade machine or retro gaming station, these large buttons really make it stand out. They're way more impressive than standard-sized buttons and give that premium arcade feel. The blue color is vibrant and consistent across all the buttons I ordered. Definitely recommended for anyone wanting to create an epic DIY arcade experience with some seriously cool lighting effects!