This type of Strike Indicator is also known as a Butterfly indicator.  It comes complete with a fine braided loop for easy attachment to your leader. The head or mop end of the indicator is 1 inch wide when flattened, this and the length can be easyly trimmed to suit the nymph and the water conditions you are fishing.
Size 1 inch / 25mm     2 per packet   Product Code:TSI-PBRUSH

The small floats are perfect for fishing Copper Johns and Bomb types of nymphs in any water including rough or broken water.  They are fully adjustable for the nymphs depth, and they are the answer to control for a heavy nymph.  Made of hard foam.
Size 3/4inch / 20mm, diameter 9mm    1 per packet    Product Code:TSI-BOBBER