The stainless steel pins are also flexible and come with plastic tips to avoid scratching your pet's skin. (thedogclinic.com)
If you have a senior cat that is sensitive to the wire brushes, look for a brush that has plastic tipped teeth. (bluebuffalo.com)
Telomeres are caps on the ends of chromosomes, protecting them much as plastic tips on the ends of shoelaces keep the laces from fraying. (scientificamerican.com)