KUMEED Twisty Modeling Assorted Balloons Magic Balloon with Air Pump Pack of 100 MATERIAL: Natural Latex,durable to withstand the twists and turns of entertaining. SIZE : approximately 0.39 inchx11 inch before inflation, 1.38 inch(diameter)x 48 inch (length) after inflation. FUN : you'll have plenty of supplies for making balloon animals & other creations for everyone. Warning- These balloons contains Latex and inflating with a pump is strongly recommended! Warranty- Any quality issue,simple contact us to get money back,only buy it from KUMEED store