THE e6 HAS A COMPRESSION RATING OF 50 THE e12 HAS A RATING OF 61. THE SOFT RATING ON BOTH OF THESE MEANS THERE IS A SLIGHTLY LOWER COMPRESSION THAN STATED AGAINST THE STANDARD. THE SPEED RATING SIMPLY MEANS THAT THE CORE IS JUICED A LITTLE. BOTH OF THESE PLAY WELL FOR SLOWER SWING SPEEDS. I HAS SEEN PLAYERS AT MY CLUB DO JUST FINE WITH SWING SPEEDS AROUND 100MPH. THERE ARE 20 BALLS IN THIS OFFER. 9-e6 SOFT, 5-e6 SPEED, 6-E12 SOFT. PIX ARE OF ACTUAL BALLS IN THIS LISTING. FREE SHIPPING ($9 VALUE) LOT 6-12 BRDG 8-14