Dan Kubin Nipples (bag of 100)Dan Kubin Perfect Nipples The Black Half Hard Nipples are Dan's most recent version of these custom made grommets, designed to be a little softer to help combat spitting issues some folks have, yet still stronger than standard nipples to hold up to the aggressive nature of hard hitting machines such as his Sidewinder. The Red Full Hard Nipples are the OG Dan Kubin custom grommets made from the most durable rubber Dan could find. They are extra rigid