you want to use soft materials like rubber, so it won’t hurt your hand (specially if you’re beginning 5A, if you’re not and are able to properly catch the CW, use whatever)
ligher = faster
people say the ideal weight is 1/6 of the yoyo (if I heard right)
the best counter weight I’ve made was I took a small soft sponge bouncy ball and kinda drilled a hole through it and may I say it’s amazing! much better than the die counter weight I had made, and doesn’t hurt as much xP