Super high quality, USA made, older "Fat wheels". Bought these from a nice woman who bought them new ($150) for her son who has Autism, She had great success with the small size on his small bike so she bought the medium when she needed bigger size from them too ($160). She (and I) thought they were the same (same wheels, slightly different height brackets).
I bought for a 26" bike for my adult daughter, thinking they would be great till I realized "they are too short!"
Bought new ones for a 26" bike on Amazon (for $130) THESE WILL NOT FIT a 24" - 26" - 700C" wheeled bike!
These are silent, do not look like typical training wheels, and don't make that noise many do with cheap hard wheels. These are soft pliable but air pressure free tires.
$20 per set
I have the small set, (your bike MUST have 10"-14" wheels) and the medium set (you bike MUST have 16"-20" wheels), if buyer buys both, it's both sets for $35
THESE WILL NOT FIT a 24" - 26" - 700C" wheeled bike!
If you are reading this, it's still available. I diligently delete all listings once an item is sold.