Evidence Tubes are available in large and small sizes. Large is 3” x 8” at 8 pieces/pack, while small is 1” x 8” at 12 pieces/pack. Small diameter tubes are ideal for single syringes and other small, narrow objects. The small tube has an end cap and a styrofoam cork for protecting sharp ends. Large diameter tubes protect evidence in the form of larger sharp objects like knives and syringes. Each large tube has two end caps and a styrofoam cork for protecting shaper ends. Made of heavy-duty crystal-clear plastic.