These high vis yellow adhesive numbers are designed to attach to either the front / rear screen or side glass of a race car. Many race series now stipulate that race numbers are to be displayed in these areas.3 Sizes are available,150mm high - for front or rear window.200mm high - for side windows.250mm high - for side windows on stage rally cars (in accordance with MUK 6.1.3)The numbers are manufactured from 100 micron cast vinyl which has an exterior life of 2 years (the longest life fluro vinyl available).Numbers are sold individually or as a pack containing 63 numbers (Six of each number and nine of number 1)Compliant with MUK regulations 11.4.1 & 11.4.2 (150 and 200mm high), MUK regulation 6.1.3 (250mm high)