The hollow molds and the coaster molds are fully matched, not only you can make penholder, but also you could use them as candle holder, flower pot, the groove of the coaster molds makes the finished products with a fence bar to water overflowing, very useful design especially when you use them as the flowerpot. Mold release spray is recommended to use when casting resin; these silicone molds are also compatible with other casting materials like cement, concrete, plaster, etc. These resin molds are made of high-quality silicone material, very flexible and durable. Color: transparent white Material: Silicone Square Coaster Mold: 100x100x16mm/3.94x3.94x0.6inch Hexagon Coaster Mold: 115x100x13mm/4.52x3.94x0.51inch Square Penholder Silicone Mold: 84x84x84mm/3.3x3.3x3.3inch Hexagon Penholder Silicone Mold:84x96x84mm/3.3x3.78x3.3inch Package Include:1* Square Resin Coaster Mold 1* Hexagon Resin Coaster Mold 1* Cubic resin pen mold 1* Hexagon Resin Penholder Mold 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.