Before use the penguin magic rubberbands i used to have the normal rubberbands (those who find at any office), but when i bought this ones, damn!!! I dont want to use another brand of rubberbands, this one are the more elastic and comfortable rubberbands i have ever touched, and the size is perfect for my wrist, they last for very long time and you can perform all of your favourite rubberband tricks with a very low risk of breaking !!!! This is a must buy if you perform magic with rubberbands.