Ear gels can come up missing when you least expect it. Not having an ear gel on your Plantronics wireless headset can make for a very unusable headset. No ear gel means a hard plastic post will stick in your ear which doesn't make for a comfortable experience.
The simple solution is to keep a pack of ear gels on hand making it handy and a convenient place to turn to when you've lost the ear gel. The pack includes 25 medium sized ear gels which is the most popular size available.