The SF-77B system includes 5cm long 3SG700-5 three barrel glass tubing shown below.  3SG700-10 glass tubing is identical but is 10cm long and can be purchased separately.

The SF-77BLT system includes SG1000-5 single barrel glass tubing shown below.

The SF-77BST system includes TGC-200-10 glass theta tubing shown below.

SG-800-5 single barrel glass tubing shown below is a smaller version of the SG1000-5 single barrel glass tubing and can be purchased separately.

Replacements for all of these glass tubes can be purchased separately.