Tyvec A4 55gsm - This fully waterproof paper will tolerate full immersion in water for several years without breakdown. White, non-toxic and recyclable, it is manufactured from compressed finely-spun polyethylene fibres. The paper can be written on with ball pens, felt tips and pencil (4B recommended). Pack of 500 A4 sheets. Not suitable for use in photocopiers.

Romer & Linear Scale Card - Handy romer and linear scales on clear plastic sheet. Scales for 1:25 000, 1:50 000 and 1:63360, plus conversion from/to miles and kilometers. Card 13 x 8.5cm

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