Here are some tips to ensure good quality zipper puller:

Check the material.

High quality zipper pullers will be made of durable materials that can withstand frequent use and weather exposure without damage. Look for pullers made of materials like stainless steel, anodized aluminum, coated brass or hardened plastics. Avoid softer metals and uncoated materials which can dent, scratch and corrode easily.

Ensure smooth operation.

The zipper tab should slide easily along the zipper tape without catching, binding or excessive friction. Rough or uneven edges can damage the zipper tape. Look for pullers with a polished, slick finish.

Check size and attachment.

The zipper tab should be securely attached at an appropriate size for the zipper. Tabs that are too large or too small will be difficult to operate. Look for pullers that attach using stitching, rivets, brass staples or high-grade adhesives. Loose or uneven attachments indicate poor quality.

Look for reinforcement.

High quality zipper pullers often have reinforced attachments or stitching for extra strength and to prevent the tab from tearing loose from the zipper tape. This helps ensure the puller lasts longer.

Consider extra features.

Some zipper pullers offer added features like integral pockets, built-in punched tabs (for key chains or lanyards), or stacked D-rings. Ensure these extra features are securely attached and will not affect the performance and durability of the puller.

Check customer reviews.

See what other customers say about the quality, durability and performance of the zipper pullers. Look for pullers with mostly positive reviews mentioning factors like smooth operation, strength, weather resistance and value. Avoid any with mentions of premature damage or tearing.

Consider the brand and price.

Higher priced, well-known brands are not always higher quality, but inexpensive, unknown brands typically indicate very low quality. Look for pullers from reputable brands that seem reasonably priced for the materials and features. Price can indicate quality, but should not be the only factor in your decision.

Ask about warranty/returns.

A solid warranty, return policy and customer support indicate that the company stands behind their product quality. Lack of any such policies suggests lower quality and higher chances of issues.