DescriptionAs we all know, hermit crabs breathe with gills and aresensitive to changes in humidity, so it is necessary to keep the pet boxmoist. Our products can help you solve this important problems,you can put our hermit sponges in their pet box and let them drink through the sponge.Features-Color: Yellow -Material: Sponge -Size: 5.00X5.00X0.10cm/1.97X1.97X0.04in -Specially designed for keeping the humidity in pet tank or crab habitat. -Apart from being hermit crab sponge, they also can be used as cleaning sponges in daily life. -Our hermit sponges are made of premium materials, no anything that could harm your hermit crab. -Easy to use, place sponge in your crab's water dish (the sponge should take up most of the dish area). -With enough quantities can meet your different using needs, practical and multipurpose.