Plastic Frames: Sturdy outer casing to support concrete weight without the wall bulging outwards. Reusable: This reusable smooth silicone mold is used to make plant pots, flower pots, DIY flower pot molds, planter molds, or home/garden decorations, easy to demold, easy to clean. Size: 18.5x12.5cm/7.3x4.9inch(D*H) is the mold size. 15x12cm/5.9x4.7inch(D*H) is the finished product size. Multi-use: Can be used with concrete, clay, plaster to make succulent planters, candle holders. How to make the pot stronger: It is better to add some coarse sand and crushed stone to the cement to make it a solid whole, just like the concrete used to build houses. In this way, place the flower pot in a cool and well-ventilated place and wait for natural drying. During drying, pay attention to the curing conditions. If the temperature is too high, sprinkle water properly to avoid weakening the curing effect caused by too fast drying.