5 Cavitiy Snap Bar Style Clam Pack. Our snap bar 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 5 cavities and hold approx 50grams of wax. Approx measurements for a closed clamshell are 140 x 65 x 13mm. The measurements for the cavity is 115 x 45 x 13mm. 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 between 55°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.