JMU Disposable Dental Paper Bibs. – Disposable Dental Bibs. Each sheet bib is folded individually, easy to use. – Size: 13″x18″ (33.5x45cm). – Highly Water Absorbent & Waterproof. Composed of 2 ply tissue and 1 ply polyethylene film backing, 2 ply water absorbent tissue and 1 ply water resistance layer will help in absorbing liquid and avoiding spills.