Rubber Mouth Props - Medium (Child) 2/Bx. Dark Gray, Latex Free. Cold sterilized, steam autoclaved or chemiclaved up to 260F. Medium and large sizes are reinforced with a non-distortable stainless steel core. Assists in keeping the patient's mouth open during dental procedures. Best for children and sedated patients. Made of autoclavable rubber. Odorless and tasteless. EXTND Rubber Mouth Props help keep the patient's mouth open during routine dental procedures. They are most suitable for children and patients who are sedated or unable to keep their mouths open for an extended period.The mouth props are latex-free, odorless, and tasteless. The rubber allows for autoclaving to a maximum of 260° F (126.67° C).