43" polypropylene brush set fits Tennant 530E  
On the larger brush in the set the finished diameter is 11” on a 6.9” core.  So bristle length is around 2.05” 
On the smaller brush in the set the finished diameter is 6” on a 3” core.  So bristle length is around 1.5”
Fits Aftermarket Tennant 86022