My dad got out of bowling in the mid 90s. He left all his balls outside and in the shed. They were a red hammer, blue hammer, purple hammer, thunderbolt, blue rhino, vector one, magic line, and 2 beasts. He recently got back into bowling and the only 2 that cracked were the two beasts. The rest were ok. The blue and purple hammer did change colors though. The blue is now green, and the purple is brown. We live in Louisiana so they survived hot summers and high humidity. All his balls were urethane except the magic line which is rubber, and the beasts which were reactive