Etymotic ResearchWestone ER-9 Replacement Filter (Single) for ES49, 9dB, Blue

Westone ER-9 Replacement Filter (Single) for ES49, 9dB, Blue

Etymotic Research® ER-9 Single Filter for Musicians' Earplugs™ (Red)

Etymotic Research ER-15 Single Filter for Musicians' Earplugs (Clear)