Product Features: -Light weight leads it to float on the water. -You can tie sucker and pumice rope together, then drag it into the water, make the sucker clamp the bottom of the water tank, establish the substrates of suspended landscape and growing plants. -Pumice surface has many holes, not only touch more area, but also absorb harmful bacteria and heavy metals in the water, is conducive to climbing and eradication of plants; plant can dissolve minerals, this not only leads to the growth of fish, but also provides fertilizer for plants. Product Parameters: -Material: Resin -Shape: Irregular -Product Size: 1)S: about 5.8 * 9.2 cm / 2.28 * 3.62 in 2)M: about 8.7 * 14 cm / 3.43 * 5.51 in 3)L: about 13 * 19 cm / 5.12 * 7.48 in -Product Weight: 1)S: about 47 g 2)M: about 96 g 3)L: about 171 g Package Included: 1 xSimulate Floating Stone