... test tube rack,test tube holder,robotic tips 2. Precision mold making 3. Dust-free injection and assembly workshop lab test ... tube rack:1. Customize test tube rack,centrifuge tube rack,Freezer Storage ... size:3mm*3mm*3mm or much smaller.Various plastic materials: PP,PE,PS,ABS,PVC,POM,PA,PBT,PPS ... ,please feel free to contact us. lab test tube rack