The most commonly used among adults and older kids are probably these:
The durable thread/fabric covered ones. They are great for G1.
Then there's these things:
Totally worthless for anything past the 'I'm determined to get these 10 wispy hairs into a ponytail' stage. For us, these were ok till about 18 months. Past that hair growth stage though, they just weren't strong enough to keep their hair up, and the 'no pull' feature just made them slick enough fall out.
Enter MY mom.
She turned these: