14pcs Round and Noise Isolation Eartips for Sennheiser CX 5.00 (B-NSEN:CL-NMH)
Sennheiser CX 5.00 In Ear Earphones / Headphones. Compatible with the Following Sennheiser In Ear Earphones / Headphones. -Studies show you can use the various sizes based on your activity and the amount of hold and isolation you would like.