Refractor cards use a special printing technology that literally refracts light to create a prism-like, rainbow shimmer across the card's surface. The visual effect is instantly recognizable — that colorful shine is what separates refractors from standard base cards and makes them some of the most chased parallels in the hobby.
Most products include multiple types of refractors, each named by their color — Green Refractor, Blue Refractor, Gold Refractor, and so on. Each color corresponds to a different print run, and they're usually numbered to show exactly how limited they are.
Refractors are rarer than commons, which means collectors consistently assign them higher value. Chasing a specific color refractor of your favorite player? Welcome to one of the hobby's most addictive pursuits.