Features: Hydroponics growing media sponges is very easy to use. They are good for starting plants from seed or hydroponics. Adopts soilless cultivation, which is clean and sanitary meanwhile can save space. Can be widely used in greenhouse cultivation, vegetable planting base. Designed for fast, maximum-convenience vegetable gardening. They can fit for most seeds, such as fruits, beans, vegetables, cereals, flowers and so on. Dimensions: diameter 32mm, height 30mm color: White Material: sponge Package Contents: 200 x hydroponics sponge Only the above package content, other products are not included. Note: Light shooting 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.