These are 8 gram tip weights that can be used with almost any graphite shafts (the 8 gram is the brown weight in the picture). There are some heavy graphite .355 shafts that these will not fit. They are made from rubberized tungsten.They're perfect for optimal swingweighting when using graphite shafts. They have a slot for venting air during assembly so there is no air pressure created (which can cause the shaft to creep out of the hosel during epoxy cure). You can also cut part of the stem off with a utility knife (or even slice a part of the head off) to use for a 6 gram weight, etc. The diameter of the head is .328", the diameter of the stem is .175", the height of the head is .255", and the full length of the weight (including the head) is 1.75". We suggest using epoxy on the stem when installing.