
Exclusive Masks is a subtheme of Bionicle that consists of 4 sets that ran from 2014 to 2015. Most sets were released in 2015 which accounted for 2 sets. As of today, the average annual growth of sets in Bionicle Exclusive Masks is approximately 6.4% per year.
In the LEGO BIONICLE universe, masks, or 'Kanohi', play a significant role. Each mask provides its wearer, often a Toa or other significant character, with specific powers. Over the course of the BIONICLE theme's lifespan, several masks were released as exclusive or promotional items. These exclusive masks became highly sought-after by collectors.