This is the superior replacement for the original "Brammer" black-fabric "round-end" link-belting that was held together with mushroom-headed metal pins each (usually) stamped with a letter "B". The new belts have only a slight curve to the end of each link and the head of the pins are now "T" section. Linking the belt - or the addition and subtraction of links - is very much easier for, instead of needing special "opening pliers" to stretch the holes and get the pins through, the holes in the belt links are in the form of slots. The pins slip through very easily and just need turning through ninety degrees with a pair of pliers to finish the job.  The also belt has much-improved resistance to oil, heat and steam. Unfortunately, it is now in short supply and the price has risen.