CooperSurgical Dilateria (Different Sizes) Sizes: CooperSurgical MX210 Dilateria Thin, 3mm.CooperSurgical MX220 Dilateria Medium, 4mm.CooperSurgical MX230 Dilateria Thick, 5mm.CooperSurgical MX240 Dilateria Extra Thick, 6mm. Dilateria is ideal for gentle, atraumatic cervical dilation. It is a by-product of Laminaria Japonica, a natural plant from Northern Asia. The plant’s stipe, or stem, is dried, sized and subsequently hand-processed to ensure proper rounding of the tip and a more uniform...