The Lotus pipe stem is hard black anodized aluminum for cooling the vapor. The pipe stem comes with a screened bowl. Clean the stem by soaking in alcohol or using an alcohol soaked pipe cleaner.
The long stem is 6 1/2 inches in length and easier to use if you have any issues with focusing on close objects.
The short stem is 5 1/2 inches in length and easier to pocket when carrying.
Both stems cool the vapor equally.