1 metre heat-resistant nitrile hoses to connect the cylinders to the Carbtune. An adapter kit for a 4 Column Kit with 4x5mm, 4x6mm adapters & an 8cm restrictor tube for altering the degree of flow within the nitrile hoses. An adapter kit for a 2 Column Kit with 2x5mm, 2x6mm adapters & a 4cm restrictor tube for altering the degree of flow within the nitrile hoses. A spare tool pouch if your previous one has been damaged. The adapter kit for the 4 Column Kit weighs around 50g (1.8oz). The adapter kit for the 2 Column Kit weighs around 25g (0.9oz). The nitrile hoses weigh around 50g (1.8oz) each. The tool pouch weighs around 110g (4oz).