Type: Low-capacity (low-cap / “real-cap / mil-sim style”) magazine intended for G36/G39-type AEGs. 
Capacity: The exact capacity for this specific “low-cap” version is not always clearly advertised — “low to mid capacity” is used in the official listing. 
Construction: Polymer body, typical of JG standard mags — to keep weight down but provide reliable BB feeding. 
Compatibility: Designed for G36-style / G39-style AEG rifles.
Realism / Mil-Sim Friendly: As a low-cap magazine, this mag aims to mimic realistic ammunition constraints (fewer BBs per mag, more frequent reloads), which is preferred in mil-sim or tactical-style airsoft games. 
Tactical Play / Ammunition Management: Using a low-cap forces more conservative BB usage and more deliberate shooting, encouraging tactics over "spray-and-pray." 
Quieter & More Realistic Handling: Compared to high-cap magazines, low-caps typically have no winding wheel and avoid the “BB rattling” noise, helping maintain stealth and immersion.