PVC , not easy to , good air permeability, you can clearly see the amount of water inside, fill the water and insert the waterer directly into the soil, you can drop of water the plants need, and help you of the flowers Grow healthier plants by preventing over-watering or under-watering. Automatic watering for up to 2-3 weeks, great for vacation and useful for your plants. Results depending on conditions, soil or plant type. Color: transparent : pvc [Easy to use] 1. Use another tool to dig a hole in the soil 2. Inject water into the bird watering ball through the spout 3. Wrap the nozzle with a sponge or permeable cloth to prevent soil clogging (recommended) 4. Down the tube and insert it into the hole you the soil. Transparent pentagram. Simple from that can undoubtedly be perfectly combined with your flowers and plants, not only a good helper for your plants, also an attractive decoration that will receive many compliments. 10 inches overall length. New size for smaller plants. Grow healthier plants by automatically maintaining soil at optimal moisture levels. Widely used for watering indoor and outdoor plants, potted plants, houseplants, garden plants, hanging plants and outdoor gardens. Package Contents: 6 x Plant Watering Globes 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.