These lightweight stretcher tubes are constructed from clear anodized aluminum and are ribbed for greater strength to help prevent bowing. Spring clip ?buttons? have a gentle curve for more comfortable and easier adjusting. The tubes slide freely for easy adjustment and have a double reference line on the inner and outer tube for easier button engagement. Adjustable in 4" increments and also in 2" increments at the end of each tubing section. The tubes are designed not to fall apart when carried in a vertical position. Fits all stretchers except for the Taylor and Roberts Senior models. Features exclusive one-piece spring clips that are guaranteed for life against breakage.