Self watering globes made by PVC,it is not easy to break.and have high transparency, you can clearly see the remaining water in the watering bulbs.Great for when you're on holiday,enough water for up to 2-3 days.Plant Watering Bulbs will automatically water your plants, Just fill water in the watering plant bulb and then poke it in soil,The water will be slowly emitted and automatically watering your plants without the need to set.the hole diameter is 0.39 inches(1cm),When using these watering bulbs, first press the hole with your thumb, and then slowly put it into the soil until it Press the soil and then loosen it (releasing your hand too quickly will cause the water to flow out quickly)You will receive 8 pcs automatic watering device in 1.96inch x 5.12inch(3cmx15cm), 4 green bulbs and 4transparent bulbs, Capacity of 75 ml per aqua care.It can be used on different plants at the same time, so you can relax in some time.This Watering Globe does not take up space, Fit for houseplants, hanging plants, potted plants, patio plants and outdoor plants, etc.Different plants need different amounts of water supply, and the angle can be adjusted according to the water demand of plantsColour:GreenandtransparentMaterial:PVCSize:3 x 15CMPackage Contents:8 x Plant Watering BulbsOnly the above package content, other products are not included.Note: Light 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. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.