Hydroponic Seed Starter Sponge Good for starting new plants from seeds or hydroponic cultivation, very easy to use, you will get 100pcs small sponges Eco-friendly and non-toxicMade from high quality sponge, these cube seedlings sponges are harmless to seedlings 30mm/1.2"Height, 3 optional diameter sizes There are 3 sizes in the different diameter to fit the different size of the net baskets of hydroponic cup pot, 32mmx 30mm/1.3" x1.2"OR 44mmx30mm/1.7" x1.2"OR 50mmx 30mm/2" x 1.2"(D x H) Universal Seed Starter Base They can fit most seeds, such as fruit, beans, vegetables, cereals, flowers and so on. Easy to useThe sponge is a good seed starter. Even if you don't have professional knowledge, you can still use them easily Specification: Material: Sponge. Colour: white. Height: (approx.) 30 mm/1.2 \ Diameter: approx. 50mm / 2.0 \", 44mm / 1.7\", 32mm / 1.3 \" (optional) Package weight: approx. 80 ~ 156g Quantity: 60pcs(each size include 20pcs Hydroponic Sponge)