"It's a Strike Indicator".... not a bobber. Uses trapped air technology and casts great and will always 'pop' back up to the surface even with a bad mend. This has been the RAGE at Red's Fly Shop with our guide staff, it is quick to move up and down the line and fast to take on and off, plus it requires NO floatant. The 1" is great for giant stone nymphs or buggers, the 3/4" is the most popular size, but the 1/2" casts like a champ and is great for small waters and spring creeks. 4 per pack*1 1/4" size comes 2 per pack.