These are the famous Envy Detailing Brushes. A set of 5 quality brushes in varying sizes. Invaluable for cleaning those hard to reach places with soft bristles and plastic body and ferrules to protect those delicate areas.
Probably the most popular detailing brushes there are. You will wonder how you managed without them for so long.
There is also a 4 brush set variant...as the 5 set but without the largest size included