To really needle felt you needle the diversity of all these needles!!
The set comes with a storage box and:
20 Triangular Needles.
Triangular needles are the most common felting needles with three sides and the are great for all kinds of felting!
Black 42 Guage is (XS) very fine is for sculpting and finishing.
Red is 40 Guage (Small) that is best for details.
Green 38 Guage (Medium) is for working and shaping.
Gold 36 Guage (Large) is for starting with core wool and shaping.