Buy RS3 Silverhawk feathers
Silverhawk feathers are tradeable items in RuneScape 3. Players use them to charge silverhawk boots. One feather gives the boots one charge. Each charge grants Agility experience equal to 10% of a small prismatic lamp, rounded down. This makes the feathers a simple way to train Agility while doing other things in the game.
Using the feathers is easy. Just use them directly on your silverhawk boots to add charges. When the charges are used, any bonus experience you have will also be spent. This helps you get even more value from your Agility training.
The feathers are stackable and weigh nothing, so they take up only one spot in your inventory or bank. Keep in mind that they are destroyed on death in the Wilderness, so store them somewhere safe before you go there. An untradeable version called silverhawk down also exists and works the same way.
Agility can be a slow skill to train. Silverhawk feathers let you gain steady Agility experience without doing laps on courses. Stock up on feathers and keep your boots charged to make your training faster and easier.