Store › SKELETON MUSCLES .ZTL Image 1 of 5 Image 2 of 5 Image 3 of 5 Image 4 of 5 Image 5 of 5 SKELETON MUSCLES .ZTL $25.00 Skeleton and all the major muscle groups as separate subtools in a .ZTL ZBrush file. Add To Cart Added! Skeleton and all the major muscle groups as separate subtools in a .ZTL ZBrush file.