MDF Instruments MD One Stainless Steel Premium Dual Head Stethoscope - Free-Parts-for-Life & Lifetime Warranty - (MDF777K-11) Gold Edition/Black Handcrafted Since 1971 | Lifetime Warranty | Free-Parts-for-Life Program | Latex-Free 100% STAINLESS STEEL CONSTRUCTION &gt; Acoustically-superior stainless steel.Available in 13 colors! SECURED TWICE &gt; Dual-leaf spring construction offers twice the durability PREVENT PUNCTURED EAR DRUMS &gt; Patented SafetyLock Eartip Adaptors are non-invasive and leads the industry in user safety PRE-ANGLED &gt; ErgonoMax Headset is anatomically angled at 15 degrees for a precise fit