The Fiocchi 615-SUR 209 W-Type is a highly sensitive shotshell primer primarily used for reloading small-gauge shotgun shells and powering Airsoft blank-firing grenades (BFGs). 
 
Key Specifications & Features
Sensitivity: The 615-SUR is a "softer" primer compared to the Fiocchi 616. It is specifically engineered to detonate with minimal force, making it ideal for impact-style grenades used on soft surfaces like grass or carpet.
Compatibility:
Shotgun Gauges: Suggested for use in gauges between 20 and 410.
Airsoft Devices: Compatible with 209 BFG adaptors, including Tectonic Innovations (Quake), Dynatex (Dominator/Timed), and various alarm mines.
Packaging: Sold in boxes of 100 units (one sleeve).