Fling Blocks will activate, and fling Mario or sprites upwards upon contact.
When flinging Mario, the Fling Blocks will not stop spinning until he touches the ground. When flinging sprites, the Fling Blocks will spin for 15 frames. None can interact with Fling Blocks are they are spinning.
Also included is a Red Fling Block variation, to insert with "fling_blocks_red.cfg". Red Fling Blocks only get activated by sprites, and Mario can use it as a sprite platform.