The HamiltonBuhl HA2 Lab Pack includes 24 pairs of Hamilton HA2 personal headphones. This lab pack comes in a durable lockable carrying case (lock not included). Built with kid's health and safety in mind, these headphones are designed to combat the spread of head lice in schools. Each headphone comes in its own heavy-duty, write-on, moisture-resistant, resealable bag. When sealed in the bag, lice are killed in 24-48 hours, without the use of chemicals.Details:Gray24 pairs of headphonesFoam cushion ear piecesCarrying caseAnti-lice bags