Additional interchangable lawncare cartridges that take the hard work out of garden maintenance all year round. Whatever the garden task, the Fortis cartridge range will have a tool to complete the job with ease. Cobra Fortis lawnmowers have a range of interchangeable lawncare cartridges available which allow you to easily convert your mower to suit different lawn maintenance tasks. For example, you can switch from a 6-bladed cutting cylinder for general mowing to a scarifier cartridge for thatch removal or a verticutter cartridge for removing of lateral growth and coarser grasses.