Sanding sleeves: material , supplier?

[Crosley.In.AZ]

I need to buy some sanding sleeves or drums.. what ever you call them.

I dont use these drum sander tools often.  But I need to now.  Often I have just bought a "kit" from Harbor freight.

Suppliers?  Material type for metal use?

3/4 inch diameter, the larger one is 2 inches diameter

[enjenjo]

I get them here  http://www.mcmaster.com/#standard-sanding-sleeves/=12tbnar  This is the media I use  zirconia alumina

[Crosley.In.AZ]

I ordered a couple sizes.  Been using them. Work well.  Thanks