I agree with the recommendations others have given about hammers by
Abel, Renner, and Schaff; they're all good.  I'd like to also mention
a small maker here on the Left Coast; I've had excellent results with
their hammers.  They use English felt and mahogany moldings.  They also
stock some piano supplies:

  Pacific Piano Supply
  (818) 779-1586

Larry Lobel
Virtuoso Piano Service
Petaluma, California