wyyl/app/Models/ProductSku.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;

class ProductSku extends Model
{
    use HasFactory;

    protected $fillable = ['product_id', 'image', 'model', 'sku', 'price', 'quantity', 'is_default'];
}