This is THE Track bike chain. Perfect for your Track, over-kill for your Fixed Gear, BMX, or Single-Speed bike; but this puppy won't break!. NJS certified for Professional Kierin racing in Japan - a sign that these chains are made to very, very high standards. 1/2" x 1/8" size, 106 links. Features a bolt type master-link for a extra secure attachment. Made in Japan.