The FLUX FF Marker is a strike indicator (bobber) for fly fishing. Brand: FLUX Product Name: FF Marker Purpose: A marker (bobber) for visually identifying strikes in fly fishing. Made of high-buoyancy urethane foam for high visibility. A mobile type that is fixed to the line with two rubber tubes, similar to a general bobber with a swing. Easy to attach because it is wrapped around the line. Bright colors provide excellent visibility. Model number/size: "R270" is written on the package. This product is very useful in situations where you want to accurately grasp the sinking of the fly and the strike, such as dry fly fishing and nymph fishing. Thank you.