Vehicle, Mobility and Transportation Design Ecofriendly Electric Diy Bicycle by Asbjoerk Stanly Mogensen The wood used for the Okovanlig, meaning "environmentally friendly", is PEFC certified plywood, harvested in an environmentally friendly way and manufactured in Germany. This e-bike has specially designed aluminum parts that turn two plywood panels and two wheels on the Okovanlig. The easy to remove Protanium lithium battery sits in the plywood sandwich construction. The Okovanlig e-bike complies with EN and ISO standards. The Protanium electric components have already been tried and tested.