Cliff Burton!

[Jamestrouton]

What bass did Cliff Burton use?

[Florox]

I don't like making these kind of replies but, sheesh did you even try to google it? Anyhow, he commonly used a Rickenbacker 4001 and an Aria Black & Gold. Both expensive and rare basses; are you trying to cop his tone?

[Kink Rimson]

Rickenbacker 4001
The same Rick but with replacement pickups
Several Aria Pro II SB basses
Alembic Spoiler
Fender Precision (or copy of)

Search the forums and you will find out about them in much greater detail!