What is a ZAMAC car?

A ZAMAC car is basically an unpainted car. ZAMAC is the material that Hot Wheels are casted from.

A normal painted version and the ZAMAC version

The term ZAMAC car was first used in 1998. There were 25 carded versions available at the ’98 convention along with a baggy Zamac and a 4 ZAMAC car set. Kay-Bee Toys also had some 2 car sets (Same casting, one painted, one unpainted or ‘ZAMAC’). In 2004, Mattel released some of the First Editions in ZAMAC. These were a Toys ‘R Us Exclusive but were later found at Target stores as well.  In 2013, Walmart issued 18 unpainted mainlines for their exclusive ZAMAC series.  These have a ZAMAC logo on the cards and are numbered 001 to 018.  Walmart continued these releases in 2014 and 2015 (18 cars each year).  Walmart also issued a premium ZAMAC exclusive car for their Rewards program in 2013, 2014, and 2015.