National Geographic Bak4 Birding Binocular Size:8X40 It is compatible with all

It is compatible with all FirstBIKE models

As a guide

The low profile multi-function valve makes it easy to find your ultimate level of comfort

ACTIVE INGREDIENTS

National Geographic Bak4 Birding Binocular Size:8X40 It is compatible with allOur field tested 8 x 40 binoculars bring a century's worth of our experience to your field expeditions. These top in their classwaterproof binoculars feature precision optics with full multi coatings toenhance brightness contrast sharpness and colour accuracy. Porro BaK 4prisms provideedge to edgeillumination making these ideal not only forbirders but also for low light viewing and astronomy. They boast a rugged.rubber armored water resistant body;