Boost (Color Changer) CKD21 (2015)

Boost is a Pixar Cars die-cast released by Mattel in 2015. The character appears in Cars.

The car carries Mattel number CKD21 and shipped in 2015 as part of the Color Changers assortment. The packaging is a color-change design — the paint scheme transforms when the car is dipped in water.

Rarity score is 67 out of 120, which classifies this release as Uncommon. Current collector value is $55.99 based on verified eBay sold data, with recent sales ranging from $47.59 to $64.39. The 10-year projected value is $66.07, with a steady outlook.

CKD21 is one of 11 Boost variants in the Pixar Cars die-cast line. Related releases include T5642 from 2010, K4587 from 2008, and CDP44 from 2015. Collectors working on the full Boost subset need all of them.

The Color Changers series released in 2015. Other cars in the assortment include Brand New Mater (CKD17), Darrell Cartrip (T5647), and Dinoco Cruz Ramirez (GDK06).

As an uncommon release, CKD21 trades at a modest premium over common cars. Peg hunters typically find one after a few store checks.