How to Build a Three-Foot Quarter Pipe Ramp for Skateboarding
The Ultimate Guide to Skate Park Ramps
HOW TO BUILD A D.I.Y QUARTER PIPE SKATE RAMP *easiest way* - YouTube
roll-in.co – Premium Handmade Ramps and Equipment
Amazon.com: OC Ramps Quarter Pipe (2' Tall x 3' Wide) - Durable Wood Skateboard Ramp Kit - Store Easily in the Garage - Great for Home or Professional Use and also Works