For added protection, wrap any of the blood collection tubes in these handy cotton Tube Protector Pads before inserting them into the blood tube containers or bubble pouches. They provide extra padding to protect against breakage and absorption ability if needed. Tube Protector Pads are made of 100% cotton, non-woven fabric. Provided in sets of 100.
For more detail: http://www.sirchie.com/catalog/product/view/id/888/?___store=international_english#.V0aE0DV97yF
