# Out of curiosity....
**URL:** https://forums.yoyoexpert.com/t/out-of-curiosity/80418
**Category:** General Yo-Yo
**Created:** [May 11, 2016, 12:40pm UTC](https://forums.yoyoexpert.com/t/out-of-curiosity/80418 "2016-05-11T12:40:47Z")
**Posts on this page:** 5
**Page:** 2
### Author:  [@Zorro](https://forums.yoyoexpert.com/u/Zorro)
#### Post date: [May 12, 2016, 1:29am UTC](https://forums.yoyoexpert.com/t/out-of-curiosity/80418/21 "2016-05-12T01:29:32Z")
> [@NathanC](#):
>
> Completely wrong… Not even in the ballpark.
> [@French](#):
>
> I thought they were 7075 aluminium, but, I don’t remember the source of my thinking that.
No no no, the axle part of them.
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### Author:  [@vegabomb](https://forums.yoyoexpert.com/u/vegabomb)
#### Post date: [May 12, 2016, 2:21am UTC](https://forums.yoyoexpert.com/t/out-of-curiosity/80418/22 "2016-05-12T02:21:29Z")
> [@Zorro](#):
>
> No no no, the axle part of them.
Where did anyone say the axles weren’t made of steel?
The only parts mentioned prior to your first post were the side effects themselves.
A bi-metal yoyo in my opinion is a yoyo with a different (usually heavier) metal placed near the rim of the yoyo. As has been previously stated, different metal components doesn’t necessarily mean bi-metal.
My 2cents.
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### Author:  [@rizki\_yoist](https://forums.yoyoexpert.com/u/rizki_yoist)
#### Post date: [May 12, 2016, 8:38am UTC](https://forums.yoyoexpert.com/t/out-of-curiosity/80418/23 "2016-05-12T08:38:28Z")
It’s a paradox. Say you have a pile of sand, then you remove one grain of sand and it’s still a pile of sand, remove one more grain and it’s still a pile of sand, keep doing that in the end you will end up with a pinch of sand. The question is, when exactly did it turn from a pile to a pinch?
You can ask similar thing with a bi-metal combination, as long as designing goes you can make the rim big enough and the base small enough that it will become side effect, but when exactly?
It’s an undefined question and the answer is subjective, just like the pile of sand.
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### Author:  [@Kristiawan](https://forums.yoyoexpert.com/u/Kristiawan)
#### Post date: [May 12, 2016, 10:12am UTC](https://forums.yoyoexpert.com/t/out-of-curiosity/80418/24 "2016-05-12T10:12:34Z")
> [@The\_Machinist](#):
>
> We’re working on an Delrin with Ti rings, what the heck do I call that?!?
I still think that would be a plastic metal hybrid.
A very fine one indeed.
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### Author:  [@ShockFaktor](https://forums.yoyoexpert.com/u/ShockFaktor)
#### Post date: [May 12, 2016, 1:31pm UTC](https://forums.yoyoexpert.com/t/out-of-curiosity/80418/25 "2016-05-12T13:31:30Z")
> [@rizki\_yoist](#):
>
> You can ask similar thing with a bi-metal combination, as long as designing goes you can make the rim big enough and the base small enough that it will become side effect, but when exactly?
If you’re saying what I think you are, then that would be a very interesting concept.
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