For respirator North (75SCL) series, which provides a level of protection from chemicals that can off gas such as bleach and thiourea dioxide. More detailed information regarding safety in use and chemical protection on package.
These 3 point pins are used for stretching fabric before painting. Due to their large surface area and fine points they tend not to damage the material while providing a firm hold. The head is about the same size as a regular thumbtack. Made from stainless steel, they are strong, reliable and won't rust.