FlatBack Hotfix Crystals are loose gemstones elements with a flat reverse side that is pre-coated with a heate sensitive glue. These flatback crystals can be easily applied using heat to produce a durable and long-lasting crystal effect.
1. N-type respirator is one of nine NIOSH (National Institute of occupational safety and health) certified particle respirators, which means that it is not suitable for oily particles.2. "N" means not suitable for oily particles.