bullets.png 5th and 10th rows

[L.C.]

What are those?

 

The image is arranged in rows as such:

1. Level 1

2. Level 2

3. Level 3

4. Level 4

5. ?????

6. Level 1 Bounce

7. Level 2 Bounce

8. Level 3 Bounce

9. Level 4 Bounce

10. ?????

[Samapico]

burst (inactive)

burst (active, after bounce)