A fine question! When the campaign ends on March 30, we will send you an email to confirm what style and bell size you'd like. We'll then update your order accordingly.
As there are only a small number of engraved bells available backers are limited to one bell per purchase.
Basically, yes. Although the Titanium bell does have a slightly deeper tone.
Kickstarter currently doesn't allow pledges for more than one reward.
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