[Harp-L] Ultrasuede valve material thickness

[enzyme rich <rmdc55@xxxxxxxxx>]

Hello,
I would like to try to make some diatonic valves out of ultrasuede since it
is highly recommended as the best material.
A search online turned up this company that sells it
http://www.fieldsfabricsonline.com/Ultrasuede-Ultraleather_c_8.html<harp-l@xxxxxxxxxx>
But, it comes in 3 thicknesses
soft
light weight
upholstery
Harp players have suggested getting material the thickness of a credit card
which is about 1 mm.
Since I'm ordering it thru the mail I can't see it so I need to figure out
which thickness to order.
The fabric website says the upholstery grade is 1 mm thick so I thought that
would be the stuff.
When I called the fabric company the salesperson said the upholstery grade
is actually about 3 times thicker than a credit card and thought it was too
thick. So now I'm not sure what to get.
Does anybody know the actual name for the best thickness for valves - soft,
light weight or upholstery?
Any advice greatly appreciated.
Thanks!
Rich