Ear Mold Impression Kit for Custom-Fit Ear Bud Speakers ensures optimum comfort, improved listening quality, and reliable audio. The kit, ideal for serious racers, minimizes exterior noise and prevents likely falling out, as molds are shaped to your ear. Equipped with impression material, return your completed molds to Rugged Radios to finalize the transaction with an additional $185.00 for Custom Challenger Ear Bud Speakers. The molds and Challenger-II earbuds together provide exceptional racing audio performance. The kit includes a syringe, three sets of 2-part impression material, three pairs of Oto blocks, and impression instructions, but excludes Challenger-II Ear Buds.