With a compound specifically suited to aluminium braking surfaces and an improved groove, the Ashima V-Brake Standard Pad Inserts give an exceptional performance on all alloy rims in both wet and dry weather conditions.4 Function Version available with:Crud Clean: Front \"plough\" eliminates dirt,Water Clean: Primes the rim surface ready for braking,Max Brake: Large contact area centred on bolt axis for uniform pressure,Rim Release: Anti-squeal design eliminates noise and the need to set \"toe-in\".