Amazon.com: Keen Ramps - Skateboard Grind Box - 4ft or 6ft Long - Skate Grind Box for Skateboards, BMX Bikes, Scooters, & Roller Blades - Professional Skateboarding Ramps for Home - Made
DIY Grind Box. How I built this 8 foot mobile grind box. - YouTube
6ft Skateboard Grind Box by OC Ramps – SkateBoardRails
South Bay Skate Co - Skateboard Grind box - 4' & 6' Box Lengths – South Bay Board Co.