Check the listing for details. ROUND Graphite Molds, 6 Versions, CGBeadroller, Premier Graphite Glass Tool. Condition: New. Listed at 56.00 USD. CGBead-Presses & CGBeadrollers are premier high quality graphite cavity marvers for the lampwork and hot glass industry. Based and manufactured in Texas, from concepts and designs by CGBeads. ---BR-16 Small Round Cavity Sizes (mm) 4mm mandrel slot9 to 15mm ---BR-17 Medium Round Cavity Sizes (mm) 4mm mandrel slot15 to 19mm ---BR-30 Large Round Cavity Sizes (mm) 4mm mandrel slot20 to 23mm ---BR-31 X-Large Round Cavity Sizes (mm) 4mm mandrel slot24 to 27mm ---BR-73 Jumbo Round Cavity Sizes (mm) 4mm mandrel slot28mm & 30mm ---BR-150 Mega Round Cavity Sizes (mm) 4mm mandrel slot32mm & 34mm CGBead tools are the premier graphite beadroller, and bead-press, tools of the hot glass industry. Graphite mold made for the lampwork industry.(beads not included) Beadrollers not only help you with those difficult curves,but also act as a measuring guide once your first bead is in the kiln.There's no more guessing if the next one will be the same size!! There's also a handy little area for marvering on the front. The reversed side is a flat marvering surface.