A:Answer Hi there!
The headset linked to this StayHear+ tips is the Quietcontrol 30. These eartips came in the Small, Medium and Large sizes.
The Small size is a Smoke/White colour, the Medium a Smoke/Gray colour, and the Large are Smoke/Black. If you're not sure which fit is best for you and don't want to have to manage returning an incorrect size, we would recommend visiting a Bose Store to trial out the sizes to ensure that you are happy with this.
We hope this answers your question, and have a great day!