Suntour self-energising (SE) rear brake cantilever
Using the Pedersen designed 'self energising' system, these brakes take the rotation of the rim and turn it into braking energy. As the pads contact the rim, they 'energise' the canti arms, dragging them slightly forwards and further inwards, thus creating extra braking power. Made in Japan...
www.sjscycles.co.uk
Bargain from my favourite online bike shop.
They also have black cable hangers by suntour for £1.99