The image shows Alctron PF8 Simple Studio Microphone Screens. These are noise reduction cylinders designed to improve audio recording quality by isolating the microphone and reducing external noise.
Here's some information for shopping:
The Alctron PF8 is described as a portable studio acoustic mic screen.
It utilizes high-quality noise reduction foam to absorb and reflect surrounding noise, creating a quiet recording space for the microphone.
The device helps capture the complete spectrum of your voice and reduces environmental interference, resulting in clear and concise vocals.