There is an individual who makes a bobber call Everlasting Slip Bobber that has a glass bead built in. A little pricey, but I have used and like a lot. Use mostly for jigging shallow around shore. Would not use for casting because of price. Goggle it and you will find it online.
Edited by gazn357 (04/01/18 11:17 AM)
Look inwardly and upwardly and you will find the answer you are looking for.