Pickguard Replacing

[DANtheDINOSAUR]

I'm getting a new guard soon, and this will be my first time switching one out, plus I'm not yet too keen on my bass' guts. I took off my guard previously and noticed it had a foil on the back. I assume this is to shield any interference from the strings/pickups.
Could I reuse this or should I go and buy new...... whatever its called.

[EagleMoon]

You can buy new. I wouldn't try and pull it off of the old one, it would probably tear. It's just foil tape and you should be able to find it at most hardware stores.

[lowtide]

The foil doesn't need to cover theentire underneath of the PG. It just covers the control area.