What a drop actually is
Every drop on this page is one React Native component: a single interaction, built properly, handed over as source code you paste into your own app. It is not a package to install, not a design file, and not a Lottie export. It is TypeScript that runs on Expo and on bare React Native.
Most of them use Reanimated for the motion and Gesture Handler for the touch. The heavier ones, the shaders and blurs and morphs, use Skia. Each drop lists the packages it needs and the Expo SDK it was built against, so you know before you buy whether it runs in Expo Go or wants a development build.
Common, Rare, Legendary
The tiers describe how much work is hiding inside, not how loud the result looks. A Common drop is a clean interaction you could have written yourself on a good afternoon. A Legendary one is the fortnight and the shader you did not want to spend.
What you get, and what you can do with it
The component source, its styles, and the small pieces it leans on. After that it is yours: rename it, restyle it, ship it in client work. The exact terms live on the license page. Some drops are free and marked as free; the rest are priced per drop, and the lifetime pass covers every one of them, including the ones not built yet.
If you would rather read the technique than buy the component, the free component reference has complete implementations you can copy, and the blog takes a few of them apart.