Track had some VERY cutting edge balls over the years...
Code Red
NRG
Green Synergy Pearl
...I have a feeling that these balls were symply ahead of the lane oil revolution though, but some of the earliest high flare monsters.
Many people love the Elite and that weight block is/was still being used.
The Assassin was an early favorite in the "flip" ball genre.
Freak..great particle solid, but died quickly...
Brings me to my favorite two Track balls of all time...
Heat and Threat...the Heats that cured with the white phasing would be #1 for me with the Threat an eyelash behind.
So, as someone stated earlier, give me a Heat with a stronger cover, not this solid/pearl combo stuff, but reactive solid with an oil sucker cover.
jim
kkps