Two wire wheeled tires and wheels! Perfect for your bi-plane project! The hub cap can be removed or painted over. The back side artillery wheel can be used (pic #2, 4,5, 6) as well. Covers can be made for the wheels. The wheels measure approximately 1 1/4" D x 1/8" W (just the tire not with the rim). The axel opening measures approximately 1/8". The tires are rubber (perhaps synthetic) & the rims are plastic. Great for your projects! New old stock. ENJOY!!!!! We combine shipping, pack well and try to ship fast. Purchase with confidence! (Please leave feedback. Thank you.)