Is it ball or extruded?N133 is Clean stuff--At $289 for 8 lbs at Bluecollar it is now the value option--It has been like Pixie Dust with 53 Vmax for me--low low ES--excellent speed--clean as can be Others work great--that is an easy combo to nail down but for me it is N133. Especially with the way prices are now--it used to be the expensive stuff--not any more