Beautify™’s Pro-Flex II is the strongest, medical grade extension tape in the industry. It is made to be hypoallergenic, comfortable, and leave little residue. Pro-Flex II provides wearers a strong bond and wear time of up to 4-6 weeks. Keep in mind that after six weeks of wear, removal becomes extremely difficult. All Beautify™ tapes will last 4-6 weeks depending on installation and care. Actual performance varies on body chemistry, climate, etc. Keep the product away from heat, humidity, and light. Store in a well-ventilated, cool, dark, dry, room-temperature controlled environment (60-80°F). Seal bags completely. With proper storage, our tapes have a shelf life of up to one year.