Molded from autoclavable blue thermoplastic resin. Removable anodized blue aluminum ruler with laser-etched scales in 1 mm and 1/2 mm increments. Left or right handed. EndoRing® II Premium Kit Kit: 1 Endoring II assembly (blue), 1 standard metal ruler, 1 e-Foam insert combo pack (48 inserts), 1 pack Gelwells (48 single-use cups) and 1 EndoGel pack (12 1ml MicroDose tubes-USA kits only)