The Volas Inflatable Lumbar Reliever, Adjustable Air Bag Waist Support Plate to Relieve Lumbar Disc and Waist Stretching Artifact Wholesale page does not list centimetres, a PSI, a user-weight limit or a pump name.
It does list air-filled support, discomfort wording, alignment wording, acupressure points, seated and reclined use, and Gray or Blue. Shop those facts plus the usable photo.
Read the Volas lumbar details.