78a would be a soft wheels those wheels are usally on long boards or cruisers "#a" would be the durometer of a skateboard wheel 90-100+ is usally a hard wheel 80- is softer. harder wheels are for tricks and street Skateboarding and they slide easier as well. as for soft wheels they grip better and you glide over cracks and dont feel it pretty cool soft wheels are for vert and crusing skateboarders
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