This is the ETS Group CZ Scorpion 3/3+ 9mm 30 Round Magazine.

This Scorpion magazine holds up to 30 rounds of 9mm ammo in its advanced polymer construction. 

ADVANCED POLYMER BENEFITS

• Extreme Impact Resistance – the CZ Scorpion magazine won’t crack or break when dropped
• Resistant to harsh chemical
• Superior heat, cold, and UV resistance – ETS Group magazines don’t become brittle over time, even when consistently exposed to harsh environments or extreme cold
• Translucent body – allows you to see your ammo count and type
• Creep resistance – the advanced polymer feed lips and body won’t deteriorate when stored for long periods of time, even when fully loaded