Determining the selling price for custom keychains involves considering several factors. Here are some key points to consider when pricing your custom keychains:
1. Cost of materials: Calculate the cost of materials required to make each keychain, including any special requests for customization, such as specific colors, logos, or engravings.

2. Manufacturing cost: Consider the time and labor required to create each keychain. This includes machine setup, programming, machining time, finishing, and any additional processes.

3. Overhead expenses: Factor in any overhead expenses associated with your business, such as equipment maintenance, utilities, rent, packaging, and shipping costs.

4. Profit margin: Determine the desired profit margin you want to earn from each keychain. This can vary depending on the market, your target customers, and the perceived value of your product.

5. Competition and market analysis: Research the market to see what similar custom keychains are being sold for. Consider the pricing strategies of your competitors, the uniqueness of your designs, and the quality of your products.

6. Target customers: Carefully consider your target customers and their willingness to pay for custom keychains. If you are targeting a niche market with high-end designs, you may be able to set a higher price point.

It's important to strike a balance between affordability for customers and profitability for your business. Conducting a cost analysis and market research will help you determine a competitive and profitable price range for your custom keychains.