Feature: 1. APPLICABLE MODELS: Silicone earbuds tips are suitable for WF 1000XM3 WI 1000XM2 SP510 SP900 C600N equivalent size headphones that fit into a charging case. 2. SILICONE MATERIAL: Replacement earbuds eartips are made of silicone to provide greater sound isolation, stability, durability, flexibility, replaceability and removability. 3. STABLE BASS: Replacement ear tips deliver deep, consistent, rich bass. Will not cause sound fluctuations due to ear canal compression and deformation. 4. ERGONOMIC DESIGN: Earbuds eartips are ergonomically designed to be worn for long periods of time without fatigue, and can be replaced with damaged, scratched or missing ear tips. 5. 4.0MM WIDE OPENING: Silicone ear tips are compatible with over 98% of all headphones. 4.0mm wide opening is compatible with headphones using 4.0mm‑5.5mm sound holes. Specification: Item Type: Replacement Ear Tips Material: Silicone Application: Inner Tube Aperture: Approx. 4.0mm/0.16in, For Headphones Sound Guide Hole: Approx. 4.0mm-5.5mm / 0.16-0.22 Headphones 4 Sizes: L M S XS Inner Hole Diameter: Approx. 4.0mm/0.16in Compatible Headphones: For WF 1000XM3 WI 1000XM2 SP510 SP900 C600N Equivalent Size Headphones, Can Be Put Into The Charging Case, Also Compatible With For BeatsX, For Senso And Most Other Earbuds Color: Blue Grey. Package List: 8 x Replacement Ear Tips Note: Please allow some error due to manual measurement.