The reduction in decibels (dB) provided by earplugs can vary depending on the type of earplugs, their design, and how well they fit in the ear canal. On average, standard foam earplugs typically provide a noise reduction of around 20 to 30 dB when properly inserted. Here's a rough guideline for the noise reduction capabilities of different types of earplugs: 1. Foam Earplugs: Foam earplugs are among the most common types of disposable earplugs. They can offer noise reduction of approximately 20 to 30 dB. 2. Silicone or Rubber Earplugs: Silicone or rubber earplugs are reusable and often have a slightly lower noise reduction rating (NRR) compared to foam earplugs, typically ranging from 15 to 25 dB. 3. Custom-Molded Earplugs: Custom-molded earplugs, which are professionally fitted to an individual's ear canal, can provide a more precise and consistent level of noise reduction, often in the range of 20 to 30 dB or more. 4. Musicians' Earplugs: Musicians' earplugs are designed to reduce noise levels while preserving sound quality. They usually provide a relatively flat attenuation, meaning they reduce noise levels evenly across different frequencies. The NRR for musicians' earplugs can vary but often falls within the 10 to 25 dB range. 5. High-Fidelity Earplugs: High-fidelity earplugs are similar to musicians' earplugs and are designed to reduce noise while maintaining the clarity of music or speech. They typically offer an NRR in the range of 10 to 20 dB. It's important to note that the effectiveness of earplugs depends not only on their NRR but also on proper insertion. If earplugs are not inserted correctly or do not fit snugly in the ear canal, their noise reduction capabilities may be compromised. When selecting earplugs for specific noise-reduction needs, it's advisable to check the manufacturer's specifications, including the NRR, to ensure they provide adequate protection for your intended use. Additionally, following the manufacturer's instructions for proper insertion is essential to achieve the expected noise reduction.