This is a Gamo Pellets known as the Whisper Pellet chambered in 22PEL, model 632272354.
The Whisper Pellet allows you to obtain the maximum noise reduction. Combining this pellet with your Gamo air rifle with Whisper" Whisper Maxxim or Whisper Fusion Technology will make it even quieter. The Whisper pellet features a copper layer and long skirt- increasing the weight" flight stability and impact energy.
Features:
Caliber: 0.22
Quantity: 150
Material: Lead