One of thousands that were made for a profit, As been said appears to be aluminum. Generally tokens,medals that were stamped for the Bi centennial it was in 1976 not 1996 are worth much due to the number that were minted. As to the star that style turned up on a lot of items stamps included. With a bronze medalet and plastic token in side the first day covers.
They were issued each year for a number of years. these generally sell for a $1.00 or $2.00 or the bargain bin
Since there were so many assorted style minted anybody with the cost of a set of dies and cost of 100 or 1,000 planchets could make and sell them.
As to value you will find most over priced on the bay or other sights and don't sell for much. Locally they are found in the 50% off or bargian bin.
Google bi centennial images not the sponsered for sale images, like the moon shots tokens many were minted few are worth any thing