Our Megatree toppers come in 2 sizes. A 12/24 and 16/32 (topper diameter 8 3/4") string version that is designed to fit 3/4" EMT conduit. We also have a 16/32 string version to fit 1-3/8" diameter top rail pipe that is commonly found in hardware stores. EMT typically comes in 10' sections and the Top Rail pipe can be purchased in 20' sections. Our toppers are made of UV Stabilized HDPE that has a custom clamp built into the topper. You can purchase the complete mega tree kit.