Level 11 security in a very lightweight package.  Superior weather guard.  All in all a super tough, small lock for security in urban areas. 

Manufacturers description

Very popular with
road bike owners and couriers, this uniquely narrow d lock caters for
those who need to balance high security with as little weight as
possible. weighing under 900g, the futura 64 uses an 11mm hardened
steel shackle in a compact steel body, backed up by the secure abus
plus key mechanism.