The number of petals remaining indicates which types of treatment are still possible :

one petal corresponds to simple cases (S), that is, straight, slightly curved or wide canals.
two petals correspond to moderately complex cases (M), i.e., more curved or narrow canals.
four petals correspond to difficult cases (D), i.e. canals taht are, S-shaped, very narrow, calcified or with extreme curvature.

Ø ISO 6, 8, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 70, 80 (Sst)
Ø ISO 15, 20, 25, 30, 35, 40 (NiTi)
Lengths: 21, 25, 31 mm
Taper: 2%

Ø ISO 8, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 70, 80 (Sst)
Ø ISO 10, 15, 20, 25, 30, 35, 40 (NiTi)
Lengths: 21, 25, 31 mm
Taper: 2%

Race instruments can be used in ad-hoc sequences according to the practitioner’s need and are also available in specific sequences. They come in both sterile and non-sterile packs.