The 31.8 alloy quick Release seat post clamp by Zoom features an included quick Release on a Black aluminum body. Lightweight at only 41 grams. Packaged on a Zoom header card. Zoom cockpit products are world-renowned for their price to weight ratio. Since 1991, Zoom has been a worldwide leader in the production of cockpit products (handlebars, stems, and seat posts) as well as suspension forks.