50 Pcs Spacers for 3mL Injection Pen Cartridge, Compatible with Most 3mL Peptide Pen, Spacer for 3mL Cartridge Peptide Pens, Maximize the Peptides from Your Cartridges

["No Residue & Full Utilization: Designed for 3ml standard cartridge containers. The auxiliary pushing structure effectively reduces internal liquid residue, makes full use of contents and avoids unnecessary waste.","Wide Compatibility & Easy Installation: Customized for regular 3ml cylindrical cartridges with precise size fitting. Universally compatible with most 3ml standard cartridges, simple to install and highly practical.","Extended Stroke & Effortless Use: Extended push stroke design helps the plunger reach the limit position, optimizing the overall operating stroke for smoother, labor-saving daily use.","Premium Reusable Material: Made of high-strength durable PLA material with great toughness and deformation resistance. Lightweight, portable, reusable for long-term use and easy to store.","3ml pen cartridge holder, 3ml cartridge holder, cartridge case, 3ml vial holder, reusable pen, 3ml cartridge, 3ml pen, 3ml cc pen cartridges, 3ml pen cartridges, cartridge storage case, vial station, bottle filling holder, 3ml style vials, 3ml pen cartridge bottle"]