This size yarn swift is made of solid wood and finished by extra fine sanding (no toxic varnish fume). The medium size can hold skeins up to 6-ft in circumference. It spins smoothly and makes yarn winding a fun job. The clamp-on base allows it to be firmly fixed at the edges of tables, chairs, benches, or any other convenient locations. It fits edges up to 1-3/4 inches thick. The craftsmanship on this yarn swift is superb. They avoid wood pieces with scars or blemishes so that their yarn swifts are less vulnerable to breakage and more appealing aesthetically. The ends of metal tying wires are hidden into holes and will never hurt your hands or the yarn.