Hey RC enthusiasts! These DMiotech sponge wheels are exactly what you need to upgrade your remote control models. At 4.5 inches in diameter with a 5.5mm shaft hole, these bad boys fit perfectly on RC cars, airplanes, helicopters - you name it! The PU sponge material makes them super lightweight yet surprisingly tough, which means your model will move faster and handle better. The plastic hub is durable but won't add unnecessary weight. Installation is a breeze - just pop them on and you're ready to roll. They're not just for looks either - these wheels actually help RC planes get that smooth takeoff and give cars better traction on various surfaces. Perfect whether you're replacing worn-out tires or starting a new DIY project from scratch. Just double-check the dimensions before ordering to make sure they'll fit your specific model. With two in the pack, you've got spares or can outfit multiple vehicles. Seriously, if you're tired of your RC rig slipping or struggling on rough terrain, these sponge wheels make a world of difference. Your models will thank you for the upgrade!