The NUPROL AK Magazine Polycase AEG Ultra-Cap Flash 1000R (Part Number: NEM-003-102-BLK) is a high-capacity airsoft magazine designed for AK-series AEGs. It uses a "flash" mechanism, which replaces the traditional winding wheel with a pull-cord for significantly faster loading. 
 
Key Specifications
Capacity: 1000 Rounds.
Magazine Type: AEG (Airsoft Electric Gun).
Style: "Ultra-Cap" / Flash Magazine.
Material: Polymer casing ("Polycase") with a flat black finish.
Winding Mechanism: Pull-string (Flash) system located at the bottom of the magazine.
Compatibility: Designed for standard AK-platform AEGs and is compatible with major brands such as Tokyo Marui, CYMA, WE, G&G, and Classic Army.