The rotating spring tines are relatively gentle on the lawn and this cartridge can be used most of the year without fear of damage to keep on top of thatch levels as well as being useful to collect up leaves during the autumn. The use of the spring tine allows for safe cultivation where tree roots may be close to the surface. This is the best cartridge for beginners to turf cultivation as it is unlikely to cause damage if set too deeply but will give great results if used regularly.