The cluster of keys at the bottom of the upper joint (protruding slightly beyond the cork of the joint) are known as the "trill keys" and are operated by the right hand. These give the player alternative fingerings that make it easy to play ornaments and trills. The entire weight of the smaller clarinets is supported by the right thumb behind the lower joint on what is called the "thumb-rest". Basset horns and larger clarinets are supported with a neck strap or a floor peg.