VacMaster Vacuum Packaging Bone Guard Sheets, 4.5-Inch by 5-Inch, 150 Sheets Bone guard sheet placed over sharp bones and edges prevents vacuum punctures and leaks Heavy-duty 6-mil thick material; Clear for full product visibility Can be frozen, refrigerated, microwaves, boiled or cooked sous vide Works with all suction and chamber bags Includes 150 - 4.5" x 5" sheets