Keeping tire pressure at its optimum level gives you better gas mileage, longer-wearing tires and a smoother ride. Simply replace the existing tire valve caps. Color will change to red indicating low pressure. Plastic. Set of 4.
they are cute and sounds like they would be great, but i tried them when i knew my tires were low to see if they worked and they never chahed color, nor did after i filled up my tires, my son tried them on his truck and no go and my sister as she has a different car than me, they didnt work on any of our vehicles.
Was this a gift?:
Bottom Line No, I would not recommend this to a friend