As the name implies  Bison No-Tip goals eliminate the need for undependable and inconvenient ground anchors  ballast bags or other goal tip over safety options that rely on human behavior to insure safety. Once properly filled with sand and installed  these No-Tip drums not only eliminate the threat of forward tipping onto players hanging on the goal crossbar but also allows easy transport on and off the field and the reduction in the stress on vulnerable welded goal joints that can cause premature goal deterioration. The combination of our No-Tip transport system and our torque tested backstay attachment system allow us to offer an industry leading eight-year limited warranty on all No-Tip goals.. Additional standard No-Tip goal features include extra deep goal depth  competition net  QwikTrack net attachment system  net storage bag and a super thick textured white powder coated finish. New Net Retention Bar keeps net away from rolling ballast wheels for transport. See chart for aluminum opening extrusion shapes and overall goal size options.. NO-TIP MATCH STATSPortable: YesGoal Opening Material: Aluminum extrusionsExtrusion Size/Shape: 4" roundNumber of Goal Sizes: 3Extra Rear Depth: StandardNo-Tip Ballast/Transport System: StandardCompetition Net: IncludedNet Storage Bag: IncludedQwikTrack Net Attachment System: StandardMeets ASTM F2950-14: YesMeets NCAA  NF and FIFA Standards: YesPowder Coated Finish: YesWarranty: Eight-year limited. .