Three color calibrated reference cards included. It brings science to the art of digital color control. Digital Grey Card gives you perfect digital color every time! 

Features: 
Including white， black， neutral gray cards. 
For perfect color balance. 
Use with any digital camera. 
Lanyard strap included. 
Waterproof， washable and durable. 

Specifications: 
Color of the Cards: White， Black， Grey 
Size: 13 * 9cm / 5.1 * 3.5in 
Weight of 1 Card: 17g / 0.6oz 
Package Size: 13 * 9 * 2cm / 5.1 * 3.5 * 0.8in 
Package Weight: 73g / 2.58oz 

Package List: 
3 * Grey Card 
1 * Lanyard Strap