I'm starting an inventory on Rebrickable, and came across a part that I can't find listed. I can describe it clearly enough and I know how it might be used (but not why it's better than the "normal" plastic), but I want to be able to add it to the tracked inventory in the database. So how do I "find" it on Rebrickable?
This looks just like a beam that has two axle holes and is made of rubber rather than ABS. It is a unit (not half-unit) thick.