Up your listening comfort level and fit with the Knox Gear Silicone Earbud Replacement Tips for In-Ear Headphones (Black, 6-Pack). This set contains Sony Wf-C510 Lightweight Truly Wireless Earbuds with Up To 11 Hours Battery Life (Yellow), Hybrid Silicone Earbud Tips, Charging Case, Limited 1-Year Warranty, Knox Gear Silicone Earbud Replacement Tips for In-Ear Headphones (Black, 6-Pack), 6 x Knox Gear Silicone Earbud Replacement Tips, and Limited 1-Year Warranty.