Chopsticks

While this may seem like a ordinary pair of chopsticks, they are anything but. They have to innate ability to increase their length, allowing them to pick up more things at one time. On top of that, they are indestructible to ensure no food is too dangerous to grab. Other than being able to grab stuff with them, they dont really have much other purpose. Maybe you could use them to poke someone in the eye or something, but that's not using them safely.

Where Pyro got them from is unknown, but he seemingly has an infinite supply of them. Following the instructions on the wrapper, once he is using them, "you can pick up anyhing!" And just like the wrapper says, there is nothing that can't be picked up when using these chopsticks. This means that anything can be turned into a delicious meal with a pair of chopsticks on hand. Considering Pyro's ability, this is a very useful tool along with his straw weapon.