Poly 4′ Rollback Swing Poly 4′ Rollback Swing – $439.00 Amish Poly 4′ Rollback Swing Poly Lumber Many colors available Includes All Stainless Steel Hardware! Bracing is made of aluminum to prevent corrosion and rust. Item #RBS4800 $439.00 Choose From Any Of These Colors – Either One Solid Color or Two Tone – All At The Same Cost!