"Compatible with Discord (2nd Generation), Rumble, and Rebel Bluetooth Earbuds.Elgin’s Foam Replacement Ear Tips provide a comfortable fit and superior sound quality while significantly reducing harmful environmental noise.  When used with our Rumble and Rebel Bluetooth Earplug Earbuds, they provide an OSHA compliant Noise Reduction Rating of 27dB and 25 dB respectively.  Each pack includes 3 sets of ear tips (2 sets in Elgin Orange and 1 set in Stealth Black). They are available in Small and Large sizes.Depending on your work environment, we recommend replacing your ear tips every 1 to 2 months to ensure optimum hearing protection and cleanliness.Please note - For health and safety reasons, opened packages of this product are not refundable.*Not compatible with our 1st generation Ruckus line of earbuds."