https://www.pcgamer.com/fortnite-adds-plunger-like-sticky-grenades/

Fortnite's latest update adds plunger-like sticky grenades, named Clingers. Used to topple enemies and structures alike in both Battle Royale and Save the World, they look like this:

Obtainable via floor loot, supply drops, supply llamas and treasure chests, the new tool is of Uncommon rarity, and has a 2.5 second explosion delay. If that's strapped to another player, expect to inflict 100 damage. Stickies attached to structures, on the other hand, deal 200.