One set of sealing O-rings for MTI Peek Split Cells. Please select the ring set for the appropriate flat cell size from "Product Options". SPECIFICATIONS Type O-ring set for EQ-PSC Dimensions For 12 Φ mm sleeve I.D. Die O.D.: 18mm, 11mm I.D.: 11mm, 7mm For 20Φ mm sleeve I.D. Die O.D.: 25mm, 20mm I.D.: 19mm, 14mm Material PTFE (electrolyte corrosion proof) Color Green