Depends on whether or not @Replies refers to his penis as a 'dinosaur', I suppose. I do and according to my dinosaur ruler, my manhood is a fraction of a Compsognathus. To get rid of the tendency to shatter the plastic for a child safe ruler needs to be more flexible, so Polystyrene-butadiene-styrene (SBS) is used instead. It is a thermoplastic elastomer that is a copolymer of polystyrene (which gives it a hard surface and durability) and polybutadiene (which is a synthetic rubber that gives it flexibility, and which allows you to twang it off the edge of the desk). As it's still a thermoplastic it can still be injection moulded, but unlike acrylic or straight polystyrene it will gradually bend and tear under a shear load rather than fail catastrophically. This plastic ruler is shatterproof, ensuring it's ideal for extended use. It has measurements in millimetres, centimetres and inches. The shatterproof ruler was developed exclusively to aid the launching of spitball projectiles in the modern classroom environment. Plastic rulers were originally made from thermoplastics like Acrylic/Luvite/Perspex/Plexiglass (Polymethyl methacrylate, or PMMA) or Polystyrene (PS). They are easily injection moulded or extruded and can be made transparent. However both materials have the disadvantage of being brittle and when bent or hit hard enough they will violently shatter, leaving razor sharp edges behind (the same was true of old Tic Tac boxes, which were also made of PS).

Long lasting and with Oxford branding, this plastic, translucent ruler measures 30cm (12 inches), using both metric and imperial measurements. At Viking, we are dedicated to ensuring that your shopping experience is always efficient and budget-friendly. That's why we're delighted to extend a free delivery option to our valued customers.Convenient and uncomplicated online shopping in no time at all! Our wide range offers you a huge selection of great brand products at unbeatable prices.

If you’re outside of England, Scotland and Wales, your delivery prices may change a little. See our complete Delivery Policy here for more information. CERTAINLY DO REMEMBER THOSE. I had one, as well as one with all dinosaurs on it. Plus another one that I can't remember what it was. Being wooden they weren't very good as straight-edges. They would create a wobbly line and sometimes the pen would actually carve into the wooden edge, forever altering it. Occasionally they would generate splinters too. Nobody ever thought of making splinterproof wooden rulers for some reason. Don't know what a spitball is? Take a strip of paper from your textbook, chew it in the mouth until it becomes a mulchy paste, then form it into a sphere using your fingers. Congratulations! You now have a spitball. Use the shatterproof ruler to launch the spitball at any of the below targets:This Transparent Shatterproof Ruler is great for home, office and school use. Equip yourself with a functional ruler that will not break and allows for perfect alignment every time. Keep it on your desk and you'll enjoy endless uses with this shatterproof ruler. I had a bendy ruler with a T-Rex head on it from the D[orling] K[indersley] Dinosaur Club. It was a potentially quite abusive weapon. Could be used for some serious spanking in sadomasochistic sex play. The transparent design ensures you'll always be able to see what you're doing, so taking exact measurements has never been easier. The ruler features both centimetre and inch measurements.