Cavitron FSI Slimline Focused Spray Ultrasonic Insert - 30K FSI-SLI 10S, 1/Pk. Dark Green, Tip Orientation: Straight. Power Level: Low-Medium. Water Slimline inserts provide optimal subgingival access. Probe-like slim diameter and feel, allows for easy insertion, exploration and instrumentation. Slimmer inserts mean more patient comfort due to less tissue distension. Contra angled FSI left or right inserts adapt to complex root anatomies and furcations in the posterior part of the mouth. 1/Pk. Single insert