Bulb seals for cover materials. Left to right. PN 10-SCM- Stainless steel or inconel solid core mesh, PN 10-HCM stainless or inconel hollow core mesh. PN 10-MDB medium density braided fiberglass rope core. Sealing cores for Fiberglass and Silica Tadpole Gasket Tapes, Solid or Hollow Core stainless or Inconel wire mesh.