I have my own rubber trees and molding machine driven by squirrel monkeys, cheaper than kids. Bob makes patches, I make tires and condoms. Bigger the better for both do to large hands and ,,, to work with. Tires may be a bit oval but good fer a few burn outs. Pay Pal monkey fruit. Condoms no guarantee so I would use 3. One on your head in case you get disoriented between north and south.