I definitely should have bought these months ago, instead of fooling around with alternatives. My 5' slim-bodied goldfish is hell-bent on destroying my dreams of a planted aquarium, and keeps uprooting my Amazon swords and elodia. These weights have holes large enough to accommodate at least 12 stems, and after securing the stems with thread I am certain that my pesky fish won't be able to move them around.Worth the price and shipping costs. 10/10 will buy again. Photo attached for scale.