It’s a personal preference everyone is different. I like the weight of metal for the cb rings if you’ve checked out my posted photos I have ball stretchers also for ball stretchers I like some of the rubber ones but you don’t feel the weight so I prefer metal for that also. Remember if you want to try some metal gear your measurements are extremely important as it doesn’t give and if it’s to tight when you get hard it won’t be able to be remove do some research and good luck I love metal.