From a 1980? Mongoose Motomag.
Got it when I was a kid. Been in my parent's attic for years.
Trying to refurb for my son.
I looked online and couldn't find any like this.

These are the rims that came with the bike.

The only markings on them are "ACS MX molded of ZYTEL"

The Bike's # is C10 337162.

Any info would be greatly appreciated.

looks like you have id'd the type of wheel, looks like an early style certainly pre-dating the later Tuff competitor the Z mag.

Sent an e-mail to ACS and got a reply in case anyone is interested...

You've got yourself some oldies there. The 6 spoke mags were the first Nylon wheels made by ACS. They were originally made from die cast aluminum, but we changed to plastic as they were lighter and less expensive. Several years later the mold was modified with small "flags" at the top of the spoke and sold as a GT wheel. The 6 spoke was discontinued in favor of the newer 5, then 4 then 3 spoke models.

ACS