Because I suffer from neck and shoulder pain I bought the Blackroll Duoball. I am stoked, you can massage tight shoulders in an excellent and targeted way with this little thing. I find it better than every physiotherapist I have seen. I can decide where and how long I need to massage and also how much pressure I want to apply. It is hard enough to get into the right spots and has the perfect size for my neck and shoulders. An absolute recommendation!
The DUOBALL 12cm is larger than most peanut balls which is amazing because it is able to release tensions especially in the lower back. I get a lot of tension in this area from my sport and this product helps a lot. I often need to travel light weight and the Duoball weighs almost nothing while still offering a lot of density, so it is perfect for me and I can take it on my travels. Highly recommended.