These tubes feature a telescopic length extension and are made of translucent polypropylene Notches on the internal tube allow for telescopic expansion to fit contained evidence A twist-lock mechanism on the round tubes retains the the extended position while the hexagon end prevents rolling The reusable tubes are rigid, durable, and resistant to oil and humidity Set of 12 Evidence Collection Tubes 7 7/8 to 13 3/4 (2047 Dia)