of the Type Abus make theirs a lot more resistant than the cheaper Master Brand
http://www.abus.com/us/Recreational-...ex-X-Plus-1025
I own one of the type I got years ago, Specialized sold it, used a Kevlar Cable inside so It rolled up smaller [My Touring bike]
But now I use a hardened Chain Axa + a ring lock , and an Abus with an integrated Lock..
Pit Locks and atomic22 Bolts will make stripping a locked bike less likely as they have unique Keys for Wrenches ..
Better
Folding Bike You Dont have to leave locked on the street... Bring it in With You..