I bought the silver Turbo Snail vinyl sticker (4" version) for the back window of my dark gray mid-size SUV (which of course is a turbo). It seems like good quality and I liked the design of this one the most over other companies that offer the "turbo snail" sticker...this one looks fierce/tough. In my opinion, I think the sticker will look best if it's similar to the color of car you drive (e.g., silver with a dark gray car, white with a white car, red with a red car). For me, the silver blended nicely on the tinted window of my dark gray SUV. The 4" version is the smallest and is not too big or too small.