MPACT PLAY BASICS:When it comes to impact play, there are two main types of sensations produced:stingyandthuddy. Stingy is a sharper sensation that is caused by light/thin toys that can cut through air quickly. Thuddy is a duller sensation that is caused by heavier toys. Generally speaking, most folks that don’t particularly enjoy pain or are newbies to impact play will likely prefer toys that produce a thuddier sensation. More Info