Soft-Core Obturator, Carrier-Based - #25, 6/Pk. Soft-Core is a gutta percha based carrier obturation system for sealing root canals. Obturators are for use with hand files or rotary files. Twist-off handle and built-in post space. Thinner core for greater flexibility to navigate curved canals. More gutta percha, fills up to .10 taper. One universal taper size fits all common preps. Package of 6 obturators