Check the listing for details. BICONE Graphite Molds, 4 Versions, Premier Graphite Glass Tool. Condition: New. Listed at 56.00 USD. ----BR-19 Small Bicone CGBeadroller Cavity Sizes (mm) 4mm mandrel slot9x25, 10x30, 11x35 ----BR-20 Medium Bicone CGBeadroller Cavity Sizes (mm) 4mm mandrel slot12x40, 13x45, 14x50 ----BR-126 Large Bicone CGBeadroller Cavity Sizes (mm) 4mm mandrel slot15x55, 16x60 ----BR-127 X-Large Bicone CGBeadroller Cavity Sizes (mm) 4mm mandrel slot17x65, 18x70 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.