The J357WW (J357) is a 56% J reloadable composite motor from AMW.
| Average Thrust: | 338.6700 N | 
| Certified By: | National Association of Rocketry | 
| Class: | 56% J | 
| Delays: | 1000 seconds | 
| Designation: | J357WW | 
| Diameter: | 54.0000 mm | 
| Length: | 326.0000 mm | 
| Letter: | J | 
| Manufacturer: | AMW | 
| Name: | J357 | 
| Peak Thrust: | 402.3500 N | 
| Propellant: | APCP | 
| Status: | Out-Of-Production | 
| Thrust Duration: | 2.9500 s | 
| Total Impulse: | 999.0760 Ns | 
| Total Weight: | 1210.1000 g | 
| Type: | Reloadable | 
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