Our clamshells are manufactured in the U.K. and are made of 700 micron plastic. Not only are they 100% recyclable they are also made with 88% recycled plastic. Recycling PET gives a slight tint to the product and depending on the source, you may notice a grey or blue impression however this will in no way detract away from your finished product. Each box has 20 cavities. Each cavity holds approx 6.5g (Clamshell holds 130g wax).Approx measurements for a closed clamshell are 150 x 160 x 18mm. The image shows a hanger hole but it does not have a hanging hole. INSTRUCTIONS: When pouring into pots, make sure your wax temperature is cool and pour slowly. We recommend your wax is no hotter than between 65°C and 70°C but ideally between55°C and 60°C, anything above this will melt the pots or find any weak spots. Pour a small amount (5mm) into each individual pot first and allow to start to set, this will check for any flaws. If all is ok, continue to slowly fill the pot.