> Well, but the Shuttle SRBs were reusable. But to use them again a lot of efforts had to be spent, comparing to what's possible with first stages of F9. That'

> Well, but the Shuttle SRBs were reusable. But to use them again a lot of efforts had to be spent, comparing to what's possible with first stages of F9. That's why Shuttle boosters are called refurbishable.