Black Fiberboard

[Hospital_Rocket]

Can someone point me to a source for that black fiberboard stuff that is often used in centering rings?

 

[rstaff3]

No, but it would be interesting to know!

 

[SwingWing]

One source is the matts used in picture framing. Yet another reason to go to Michael's

 

[rabidsheeep]

not solid sheets, but fliskits has actual centering rings made from them

https://fliskits.com/products/01prod_fs.htm