SparkPlugs® Corded Metal Detectable Earplugs - 100/bx - 6615 Soft comfortable fit. SparkPlugs® earplugs are made of extra-soft, extra light foam. Their tapered shape fits easily in the ear canal, and seals gently and snugly without pressure. Theyre so comfortable youll forget youre wearing earplugs. Independently tested: NRR 33. SparkPlugs® earplugs offer a high NRR 33, making them suitable for most noisy environments. So, while they look like fun, they provide serious protection. Metal detectable Version. SparkPlugs® also come in a metal detectable version. The bright blue color is perfect for food processing applications. The enclosed metal ball bearing eliminates any exposed metal. The ball bearing and cord are in separate holes so that the earplugs remain detectable even if the cord is removed. The earplugs are corded to prevent earplug loss. Our track record is perfect for NASCAR®. Random multi-colored swirl make for winning compliance to your hearing protection program. When it comes to comfort and compliance, nobody beats Moldex® to the finish line. Features • 100% PVC-Free. • New metal detectable cord. • SparkPlugs® NRR 33 is the highest rated metal detectable earplug. • Extra-soft foam and tapered design fit snugly and comfortably in the ear. • Tapered shape for easy insertion and removal. • Shaped to fit even very small ear canals. • Non-irritating smooth surface.