This 50 lbs add-on, 5 10 lbs plates, is designed for heavy lifters who need more resistance on their Inspire Fitness machine. DESIGN: (5) 10 lb. weight plates made of steel; Compatible machines include: FT1, FT2, SCS, M1 and M2 Limited Lifetime (Residential) SHIPPING DIMENSIONS: Length: 11" Width: 7" Height: 6" Weigh: 50 lbs.