in my yonex duel g 310 version, i found that the little green but cap weighs in at 2.2 g. when you take it out, it changes the balance almost 1 full point towards head heavy (more than 1/16 of an inch, just under 1/8, using a ruler and balancing on edge of a table). kind of a convenient way of fine tuning! i would imagine this effect is slightly more pronounced in lighter rackets (eg vcore f 97 290) and less so for heavy ones (duel g 330).