The V-Cheetong Professional Reptiles Snake Sexing Probes are made of high-quality materials for durability and long lasting use. The round ball tip design is more accurate to measure the sex of a snake. The smooth round ball tip design prevents damage to the snake. The rust prevention, oxidation prevention, and warping preventing features protect the probes from being damaged by the environment. The V-Cheetong Professional Reptiles Snake Sexing Probes are suitable for different sizes of snakes.