Tyres showing Steel wires

My speed 400 tyres are showing steel wires. I came to showroom and the mechanic says it is due to tyre burn or off-roading. But I do not do any of these. Most of my commute happens in the city. Can someone help me to know the reason ? Thanks

My speed 400 tyres are showing steel wires. I came to showroom and the mechanic says it is due to tyre burn or off-roading. But I do not do any of these. Most of my commute happens in the city. Can someone help me to know the reason ? Thanks