Roll Up Roll Up
Basically they are used for massaging out your muscles. They are very effective for relieving sore muscles, after training especially. They are selling them for less than half the price you pay in the shops but as well, they are also a lot firmer, so you get a deeper and more effective massage.
They are selling them for only 12 Euro
See their facebook page https://www.facebook.com/firmroller or contact Daniel at firstname.lastname@example.org