Parafilm® M Sealing Film Self-Sealing, Flexible, 4 Inch X 125 Foot (1228479_RL) 1/RLEfficient and cost effective covering for test tubes; beakers, vials; petri dishes; flasks; various other instruments and objects with irregular surfaces; overwrap to further secure stoppers, lids and caps; and shelf or tray liner to prevent slipping of bottles or instruments Flexible and self sealing material allows it to cling around irregular shapes and surfaces Stretches more than 200% of original length Resistant up to 48 hours against many polar