Chums Switchback Basics,

• Distinctive bright blue coloring for easy detection Reversible dual port retainer
• Top port for small or thin frames
• Bottom port for large or thick frames
• Fits over temples with rubber inserts
• Low thermal conductivity, chemical reactivity and toxicity
• Does not support microbiological growth
• Resistant to oxidation, ozone, and UV light
• 17 length, end-to-end