SpinOlution Mach & Hopper 32oz OSAY bobbins SpinOlution Mach & Hopper OSAY 32 oz bobbins (the large bobbin on the left is the 32 oz OSAY bobbin, compared with an 8oz Mach bobbin and a Bee bobbin). The Mach and Hopper wheels are supplied with standard 8 oz bobbins but you can use extra large 32 oz bobbins if you fit your wheel with a SpinOlution Over-Sized Art Yarn Flyer Assembly. They will not fit on the standard flyer assembly. The same bobbins fit both the Hopper Travel wheel and the Mach spinning wheels when fitted with an Over-Sized Art Yarn (OSAY) Flyer Assembly. The bobbins are about 15 cm in diameter and 24 cm in length, holding four times as much yarn as the standard Mach bobbin. Available Price £39.25 Shipping £3.50 to UK and Europe