[Walking program] Math wood keyring (black wood / wood bottom black lines)

At the time 2015/11/22 We organized the "Math Wars" this special themed events At the event we use the arithmetic symbols and figures to let everyone Puzzle Also followed the activities of the Special launch Math series of products Always give people a warm feeling of wood Although the presence of a small but full sense Wear it Add a little embellishment for yourself! --- <Math wooden key ring> Material: beech wood Diameter: 3.5cm Thickness: 0.6cm Origin / manufacturing methods Made in Taiwan