... and expansible. Type 1 1. Pure rubber, with no reinforcement2. Section width 10.5mm3. Section height ... a new mold. Type 21. Pure rubber, with no reinforcement2. Section width 16.4mm3. Section height ... a new mold. Type 31. Pure rubber, with no reinforcement2. Section width 16.4mm3. Section height ... a new mold. Type 51. Pure rubber, with no reinforced layer2. Section inner diameter 16mm, outer diameter ...