Wing, the drone delivery subsidiary of Alphabet, has unveiled a series of new drone prototypes designed for different workloads, reports The Verge.

The new drones will have the same basic elements as the devices the company currently uses to deliver medicine and other small cargo. According to the CEO of the company, the goal is to match each cargo with a device of the appropriate size.

“Here at Wing we spend a lot of time thinking about how to move packages through the sky. Solving the problem of on-demand delivery will always require a variety of vehicles. Just as the ideal vehicle for carrying a ton of gravel would be a dump truck rather than a sedan, the ideal aircraft to carry a bottle of medication is not the same as the best one to deliver a gallon (3.8 litres – editor’s note) of milk, and neither is suited to deliver a refrigerator,” says the CEO.

The company calls its project The Aircraft Library. In the video, it showed several drones of different sizes. Including a larger one that will be able to transport more than 3 kg, and a smaller one that will carry prescription drugs weighing up to 300 g. The Wing flagship drone is designed for loads of no more than a kilogram.

At the same time, the company says that the weight of the cargo should not exceed 25% of the weight of the drone. Referring to the data from Amazon, Wing claims that about 90% of all packages for delivery weigh no more than 2.3 kg (5 lbs).

The company does not reveal when it plans to introduce new drones. Now they are still at the stage of prototypes.