SUNYUM Hydroponics Seed Growing Media Cylindric Sponges 1.2x1.3 for 1.8" Net Cup Pots Basket Pack of 100 (1.8)

Using Tips: 1.The sponge is environmentally friendly and non-toxic. Their color is ivory white but when they touch the air, the color may become the light yellow. This case is normal. It won't influe..