Casio launches the G-Shock GMA-S2100PR-4AER in pink for Breast Cancer Awareness Month, featuring a ribbon motif and 200m water resistance. Preferred SourceAs an Amazon Associate, Gizmochina earns from qualifying purchases. Links on this page may earn us a commission at no extra cost to you. Casio has announced a new addition to its G-Shock lineup, the GMA-S2100PR-4AER, a limited-edition watch designed to coincide with Breast Cancer Awareness Month this October.