RBA or a ReBuildable Atomizer is a type of vaping atomizer. RTA's and RDA's are both RBA's. The Rebuildable Tank Atomizer or RTA is a tank system ( you fill a tank with ejuice for vaping ) and Rebuildable Drip Atomizer or the RDA is a drip system ( you drip onto the coils for vaping ). With all rebuildables, you build the coil. Even though building a coil is not difficult it's recommended that if you're new to vaping you should start with pre-built coil vape starter kits. If you're a pro, eJuice Direct has a large selection of rebuildable tanks for you to choose from. Check out our collection below!