- The regular barrel has an inside diameter of 2.0 mm and is 5 mm deep. - The mini barrel has an inside diameter of 1.5 mm and is 5 mm deep. - Stainless steel. - Can be sterilized by any method. - The barrels and the plungers are precision ground for a perfect fit, assuring accurate and trouble-free delivery. - The heavy duty springs are hardened and tempered for a lifetime of smooth operation. **For further product information, please contact Chat Support**