Vintage French fasteners. French in origin. White in color. I'm pretty sure these are made with a polished cotton thread. Repeating chain link with a Turkish knot at one end. Fasten into the loops.  Can be shortened if needed.since the knot will fit into any of the chain links. 
 
Photos are a good represenation of actual color and condition.
 
Availability-Price
 
At the time of this listing there are 32 fasteners available. 
 
Each fastener measures
 
23.5 cm in length x 1.5 cm wide across the chain link.
 
Fixed price per fasterner: €8
 
Condition
 
Old stock. Excellent unused condition.
 
Shipping
 
Please refer to our homepage for shipping details.