Riser height 8¼ ’’, C10 starter kit with connectors and top extra riser hook straps plus four 2 step extensions with connectors # of steps / risers 18/18 & 18/19, Floor to Floor stair heights 145" to 152" (18 risers) & 153" to 160" (19 risers), Horizontal Run 139", All connecting fasteners with Allen key, parts list and assembly picture instructions included. Package Sizes & Weight 5"x14"x 64" 63 lbs. + four (5’’x7’’x 23’’, 15 lbs) American customers pay in US $. (no sales tax). All payments including with credit card mare made through Shopify/PayPal.