What is this

[jasontheredhead]

i found a piece of wood that had this black plastic like stuff on it and it is super slippery and i want to make a box out of it but i dont know wat it is

anyone know? or any ideas

 

[Jwenz]

If you could shoot a picture up here I Think we could possible help describe it. Could be some type of roofing? who knows...AGAIN picture would help