Rotation speed of profile instruments

Direct lines from Cohen: The recommended rotational speed for Profile instruments is 150 to 300 rpm, and to ensure a constant rpm level, the preferred means is electrical motors with gear reduction rather than air-driven motors. Also know The profile system was first sold as the "Series 29" hand instruments in .02 taper, but available in .04 and .06 taper Tips of the Profile Series 29 rotary instruments - constant proportion of diameter increments (29%) Profile instrument specifications Cross sections: U-shape design with radial lands and a parallel central core Lateral view: 20° helix angle, a constant pitch, and bullet shaped noncutting tips Blades have Neutral or slightly negative rake angle Acts like Reaming action on dentin rather than cutting