There's no such thing as "100 mph tape" in common usage. It's likely you're thinking of something else. Could you clarify what you're referring to?

* Are you thinking of a specific type of tape used in a particular industry? (e.g., construction, automotive, etc.)

* Perhaps you're thinking of a specific brand name?

* Could you describe what the tape looks like or what it's used for?

Knowing more about what you're referring to will help me give you a better answer!