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Two Way Envelopes - Choose Small or Medium

Two Way Envelopes - Choose Small or Medium

SKU: 217537123517253

Tyvek Envelopes


3 Small Double Opening Envelopes made from White Tyvek


Water resistant, Tear Proof & Long Lasting


Switch items, Force outcomes, Predict choices or perfrom Bank Night Routines with these durable Tyvek double opening envelopes


Upon purchase an explanation video link will be sent to you.



Small - 7cm x 10cm - Fits Playing Cards

Medium - 10cm x 15cm - Fits Postcards


    Our Tyvek Envelopes are built to last.

    However, if your device becomes compromised The British Secret Service offers a 1 year guarantee.

    Simply contact us, return your device and it will be fixed.

    No Questions Asked.


    The British Secret Service employs Royal Mail to dispatch our devices. 

    All devices are sent in plastic or cardboard protective packaging.

    The shipping times are estimates stated by Royal Mail as a delivery aim.

    These shipping times start when the order is fulfilled, and as all devices are crafted by hand so they may take up to 3 days to fulfill. We thankyou for your patience. Trust in us - We will always fulfill your order.

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