The Rollybar of Lapis is a very effective training tool for improving coordination and muscle strength in climbing and bouldering. The middle part is mounted on ball bearings and thus increases the holding force drastically. This leads to a maximum training effect and in the beginning to a few sore muscles. Under the Rollybar we always recommend a mat or crash pad basket. The material used is like climbing holds a resin-sand mixture. This one also has a good grip with your hands and it also looks cool ... Who wants to be strong should buy such a part.