This is the best navy oakum which is steeped in Stockholm Tar. Generally it is used for caulking below the waterline, due to its high durability while cotton caulking is reserved for above the waterline. The name comes from the old English for “off combings” and in the past the boys and girls of the Victorian workhouses had to pick it from old tarred ropes at a rate of a couple of pounds a day. Those were the good old days when you could actually make money from old rope. Nowadays oakum is produced from virgin hemp.