4' wide x 4' high. It is recommended that hoops are spaced 5' apart. $8 each. Snap clamps (to hold poly on tunnel) available. Reemay / row cover / agribon-19 ,(as seen in photos) available. 30 x 100' pieces for $50 Poly for mini tunnels, 6mil 4yr (with 3 years left): 10 x 220' for $150. Could also recommend alternative to snap clamps for holding poly in place.