A popular Custom trick is to remove wiper blades and arms and cover the wiper shafts with these bullet shaped covers.
Made from Brass and chrome plated. Held in position with an engineering screw / stud. Allen wrench provided. 

These are for 5/8" diameter wiper shafts. Overall Diameter is 1 1/4". Height is 1 3/8"
Listing is for 1 pair.