One of the things Apple changed from iOS 9 to iOS 10 is the size of the knobs that appear on the adjustment bars for volume level and song scrubber. The latter has larger knobs, which make grabbing onto them a little easier than in earlier versions of iOS.
If you’re jailbroken on iOS 9, and you want the same characteristics from iOS 10 to fall in your lap, then you’ll find a new free jailbreak tweak called LargeCCKnobs quite useful.