Size         Arbor Grit            Maxrpm  Type
4-1/2" 7/8"  36# 40# 60# 80# 120#  13300   T27 T29
5" 7/8"      36# 40# 60# 80# 120#  12000   T27 T29
7" 7/8"      36# 40# 60# 80# 120#  8600    T27 T29

Characteristics:
1, Provides the same hight performance as standard flap disc, but with 50% more usable abrasives.
2, The added abrasive gives a cushion to the product which provides a quick grind with less heat to produce a higher quality finish.
3, 30% longer life than regular density flap disc.
4, Aggressive cut and long life, Less pressure for aggressive stock removal and long life.