Ionic double trim but i`m not on about the multipole brush i mean the 1 that is a replacment and goes on there higher poles 12-18" double trim converted for standard pole thread and re-jetted with 2mm jets,the main thing is bristles and lots of them if you look at a brush in say B&Q or asda the bristles are minimal compared to the above brush i`m on about,The more bristles the better in a brush but more importantly it`s the bend of them,to soft is no good and to stiff is no good your looking for an average splay on the glass with the brush still keeping it`s shape,by this i mean the brush not pushing flat on the glass square in shape and able to cut into the corners,at the end of the day most flocked brushes are mostly the same in performance where`s with monos you can get a good one and an awfull one,the new multipole ionic brush is also a very good brush and is exellent for rinsing on the glass but when you use it you can tell it was designed for being used with hot water as it`s overley stiff and requires hot water to soften the bristles slightly,i`ve used almost every brush on the market you name it DIY all major names and this is the opinion i`ve come to.