100% traction: when the lawn is wet or the property falls with numerous heights and depths, the spikes give the robot mower better traction, no more digging in the lawn. PREMIUM MATERIAL - Our spikes are made of 100% stainless steel. A material-related advantage is that the spikes are rust-proof and therefore . Easy to install and beautiful and healthy lawn: simply center the spikes on the wheels and attach with the included screws. The high-quality spikes a beautiful lawn. No more holes in the lawn by driving your for Indego lawnmower robot. for Sileno city lawn mower robot for 250 Smart for 300 for 400 for Life 1000 for 500 Smart for 500 Smart+ for 600 Colour:Silver Material:Stainless steel Package Contents: 1x Lawnmower Auxiliary Wheels Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.