Extremely cool cruise night exhaust tips 2 1/2 OD

Icetech said
They are supposed to go inside and aren't tips..... this is a very odd ad...

These look like spark arrestors for off road vehicles (bikes) to prevent fires .

Should be installed inside pipes.

EDIT :

I was wrong.

Here they are and an explanation of use.

Summit Racing SUM-629022 Summit Racing™ Exhaust Insert Cones | Summit Racing