One Tropical Crate Key, delivered straight to your RemixMC account after checkout.
The full reward pool is viewable in game, so you always know what you are opening. Head to the crate area at spawn and right click the Tropical Crate to see every item, cosmetic and bonus it can drop before you use a single key.
Any Tropical Key purchase, no matter how many keys you buy, also unlocks the exclusive Tropical Tag on your account. Equip it from the tags menu in game and wear it in chat.