This 3.5oz (100g) tub of chunky crushed chalk is designed for climbing on rock or artificial walls. It's also great for use on flying trapeze or for absorbing excess adhesive after taping an aerial hoop. Climber's chalk can also be used to cure sweaty hands when doing gymnastics, acrobalance or hand-to-hand. The tube this chalk comes in is pretty tough and has a secure lid so you can bosh it in your rucksack without worrying about it spilling.