马来西亚采购需求：珐琅别针、军徽、金属翻领别针、硬珐琅别针、软珐琅别针、运动奖章

I'm looking to place an order for 1,000 customized keychains. Could you provide some suggestions on the ideal size and materials available? I'm open to exploring different options that would appeal to our target audience, as well as any additional features that could add value. Also, if there are any popular designs or styles that have worked well for other clients, I'd love to hear about those too. Let me know what you recommend, as I want to ensure we choose the best options for our project!