When a single worn part costs $20.99 and a replacement device costs many times that, the answer is usually a part swap — but not always. This guide gives the decision criteria, using the parts listed for Narwal J3 / J4 / Freo X Ultra / J4 Lite / J5 / Freo Z Ultra Sweeping (8 variants) as the working example.
Narwal J3 / J4 / Freo X Ultra / J4 Lite / J5 / Freo Z Ultra Sweeping: Compatibility
The compatibility string on the listing names Narwal J3 / J4 / Freo X Ultra / J4 Lite / J5 / Freo Z Ultra Sweeping verbatim. Closely named models in the same family are the main source of wrong orders, so read the model printed on your device (usually on a sticker or in the device's app/settings page) and match it character for character — "Pro", "Plus", "Ultra", "XL" and revision suffixes all matter.
Variants and Pricing
8 variants are listed, $20.99–$66.99. Smaller packs suit a single device on a normal replacement cycle; larger packs suit multi-device households or topping up.
| Variant | Price (USD) |
|---|---|
| 12PCS | 51.99 |
| 16PCS | 58.99 |
| 8PCS | 35.99 |
| 10PCS | 37.99 |
| 4PCS | 23.99 |
| 6PCS | 30.99 |
| 2PCS | 20.99 |
| 20PCS | 66.99 |
Prices are as listed at the time of writing; the product page is authoritative.
Who This Is For — and Who Should Skip It
Skip part replacement when multiple subsystems fail together or when the failed part's price approaches half of a new unit — the remaining wear on other components tips the math toward replacement.
Before You Order
- Match the model on your device to the listing's compatibility string, character for character.
- Pick the variant that matches how many devices you run.
- Orders over $55.99 ship free worldwide; 30-day returns and a 12-month warranty apply.
- Fitment questions: support@robotparts.site replies within one business day, Mon–Sat 9:00–18:00 GMT+8.
FAQ
Does one variant fit every listed model?
The compatibility string covers the models named on the listing. Variants differ in quantity or configuration, not in fit — check the variant table above for what each option includes.
What if my model is not in the compatibility string?
Then this listing is not a verified match. Check the product page for the full fitment list, or email support@robotparts.site with your model before ordering.
Full variant list and current prices: For Narwal J3 / J4 / Freo X Ultra / J4 Lite / J5 / Freo Z Ultra Sweepi.