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FIRE PISTON - Pyro Piston with Transparent BodyThese fire pistons come with the added bonus of being able to see exactly what happens in the barrel during that moment of rapid compression.Heres what happens: A small piece of cotton wool is placed into the bottom of the plastic tube. When the air is rapidly compressed by a piston, the air temperature increases and the cotton ignites, creating a 'flash' of heat. The Fire Piston demonstrates the rise in temperature that is produced when a fixed mass of gas is compressed. In this apparatus the contained air is compressed by a hand-operated piston. The heat generated is sufficient to ignite a small quantity of tinder supported inside the transparent cylinder. Suitable tinder is included, but almost any organic material will work if dry enough, i.e. cotton, charcoal, tissue paper, etc. The Fire Piston can also be used to demonstrate the need for oxygen to support combustion, by attempting to re-ignite a piece of part-burned tinder (charcloth supplied).These Pyro Piston itself (available in green or silver) have built-in storage compartments which are also prefilled allowing you to store your dry tinder/lube/vaseline...etc. The piston rod also unscrews to reveal a 64mm fire steel, giving you twice the chance of starting a fire in the wilderness.To create a fire, the piston must be rammed quickly into the sealed cylinder with a single stroke. The compression of the air causes the temperature to rise rapidly to 260 degrees Celsius, or 500 degrees Fahrenheit. This causes the tinder on the piston face to ignite, which is then withdrawn and transferred to a larger pile of kindling to create a fire.OR..Unscrew the piston rod and land a spark on your dry tinder using the built in fire steel.This kit consists of:1 X Fire Piston aluminium plunger (GREEN)1 X Fire Piston aluminium body (GREEN)1 X 64mm FiresteelCharcloth & Lubricant filled capsBag of spare sealsEasy to follow instructionsPiston length: 115mmFiresteel length: 64mm