This is a LIFELINK stock. The powder ring can be easily attached and detached. The material is aluminum. The length is 115cm. On mornings with fresh snowfall, you can use it with the powder ring attached, and then remove the powder ring when skiing on packed snow slopes. The straps are designed to detach easily, as stocks are said to be prone to getting caught and pulling you under in an avalanche. (However, this doesn't mean they'll easily detach when you fall.)