We're in pretty good with Seimitsu in terms of them giving us heads up on what's coming out.  They threw us a curveball with this product that is hand made in Japan and is not really part of their catalog.

These straps are all hand made in Japan and have an M6 male attachment that screws into any M6 sized balltop from Hori, Sanwa Denshi and of course Seimitsu themselves. 

These are meticulously made and are very durable as we stressed tested this ourselves and can withstand quite a bit of stress when pulled.

Note that the balltop is NOT included