The mirror is the right size for my needs - watching my rear view in a 22 foot boat. It is convex so it allows a wider view than a flat mirror would. The suction cup is large and sticks well to smooth surfaces. The texture of the rubber on the suction cup makes me cautious about leaving it in the sun or any exposure when not necessary; it may not be the best grade of material and I will protect it from the elements. A great deal for a reasonable price.