Based on this product's specifications, here are some alternatives and similar models
Sledge Hammer Fiskars IsoCore 8 lb, 36 in handle, Shock Control System
Summary description:
Fiskars IsoCore sledge hammer with an 8 lb head and 36 in handle features the Shock Control System to reduce vibrations and rebound during heavy demolition and driving tasks. Designed for delivering powerful blows while improving user comfort and reducing fatigue, it suits construction, landscaping and demolition work where controlled impact and durability are required.