Slime Block

Slime Blocks are translucent Blocks that the Player can bounce on.

Use
Slime Blocks are used in lots of self-propeling Redstone contraptions. They are also used as trampolines to break a Mob or Player's fall. They are used for easy storage of Slimeballs.

Crafting
9 Slimeballs => 1 Slime Block

1 Slime Block => 9 Slimeballs