Whats the difference between the Taylormade TP Red LDB balls and the TP Red balls?

same thing with TP Black. theres TP Black and TP Black LDP. whats the LDB stand for and why does it make the ball cost more?|||low drag performance. Each dimple on the golf ball has it, making it a lot easier to hit a good drive or iron shot even on mis-hits. It keeps your ball air born longer to increase yardage. I play the TP Black, and love it.