MDF Wheel, 6mm thick fibre board, 54mm and come with drilled centre holes for 4mm dowel, There are also available in 54mm and 74mm or you can order a mix bag
Wearable Tech STEAM Kit, Teachers you won't want to miss the opportunity to incorporate a fun-filled, ART and Science crossover project, Includes: 10 ft of conductive thread, 2 x 3v lithium batteries, 2 x sewable 3v battery holders, 2 x LED, Assorted beads