The present invention is directed to improved multi-layer golf balls. In this regard, a smaller and lighter core is produced and metal particles, or other heavy weight filler materials, are included in the cover compositions. This results in a molded golf ball exhibiting enhanced perimeter weighting....http://www.google.fr/patents/US5984806?utm_source=gb-gplus-shareBrevet US5984806 - Perimeter weighted golf ball with visible weighting
Perimeter weighted golf ball with visible weighting