[Pumice Stone Material]Swimming pool pumice cleaner is made of natural pumice and other abrasive materials,high-density,sturdy and reliable,odorless and harmless,safe to use and effective in cleaning up stains. [Effective Cleaning]Pumice stone effectively cleans rust, lime, minerals and stains from tiles, providing you with a comfortable pool in the summer. Besides, pumice stone can also be used for home grilling, kitchen sink and toilet cleaning to meet your daily needs. [Easy to Use]Target stubborn stains with a pool pumice stone, rub repeatedly and vigorously to remove residue, then rinse with clean water to get fresh tiles. [Multiple sizes]The pool pumice set contains 2 different sizes of pumice, 3.93 x 2.75 x 1.57in is 6pcs, 5.9x1.4x1in is 6pcs.It is very convenient to choose different sizes of pool pumice stone according to different places. Colour:grey Material:Stone Size:10 x 7 x 4cm, 3.5 x 2.5 x 15cm Package Contents: 12 x Pools Pumice Stone Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.