SpinOlution Mach & Hopper spare bobbins The Mach and Hopper wheels are supplied with 3 bobbins but you can buy extra bobbins here. The same bobbins fit both the Hopper Travel wheel and the Mach spinning wheels. The bobbins are about 10 cm in diameter and 14 cm in length, holding nearly two and a half times as much yarn as an Echo or Bee bobbin. Available Price £29.75 Shipping £3.50 to UK and Europe