Available in three sizes to provide better control and added comfort. Light weight syringes are made of surgical grade aluminum and stainless steel, which reduces hand stress during injection. No removable parts. Compatible with 1.7 and 1.8ml cartridges. Standard Syringe - Larger thumb ring, standard length plunger. Fusion Syringe - Medium thumb ring, standard length plunger. Petite Syringe - Smaller thumb ring and finger grip, shorter plunger length.