FTL Mines

Hi,
What do you think about FTL Mines?  These mines would jump into FTL when
an
enemy ship got near, hopfully damaging or destroyering the ship, they
have the
fallowing stats:

Hull: 6
Cost: 43
Systems:
FTL
Level 1 Screen

This should, along with "claymore" asteroid mines should take care of
there
266 ship fleet, good thing two, as I only have 24 combat ships:)
Bye
Stephen